From f22ff5523af8b365167cb79189f8b91470d57c8c Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Sat, 29 Jun 2013 00:24:34 +0800 Subject: ACPI / dock: avoid initializing acpi_dock_notifier_list multiple times Function dock_add() will be called multiple times if there are multiple dock stations, which causes acpi_dock_notifier_list to be initialized multiple times. To avoid that, move the initialization of acpi_dock_notifier_list from dock_add() to acpi_dock_init(). [rjw: Changelog] Signed-off-by: Jiang Liu Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index 82656075338..c36de862fd5 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -1007,7 +1007,6 @@ static int __init dock_add(acpi_handle handle) mutex_init(&dock_station->hp_lock); spin_lock_init(&dock_station->dd_lock); INIT_LIST_HEAD(&dock_station->sibling); - ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); INIT_LIST_HEAD(&dock_station->dependent_devices); /* we want the dock device to send uevents */ @@ -1078,6 +1077,7 @@ void __init acpi_dock_init(void) return; } + ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); register_acpi_bus_notifier(&dock_acpi_notifier); pr_info(PREFIX "%s: %d docks/bays found\n", ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); -- cgit v1.2.3-70-g09d2 From ed633e709fa633c6bc24f4d6ecb55ad0c14fd335 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Sat, 29 Jun 2013 00:24:35 +0800 Subject: ACPI / dock: drop redundant spin lock in dock station object All dock station objects are created during initialization and don't change at runtime, so drop the redundant spin lock from struct dock_station. [rjw: Changelog] Signed-off-by: Jiang Liu Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 15 +++------------ 1 file changed, 3 insertions(+), 12 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index c36de862fd5..750f958ef0b 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -63,7 +63,6 @@ struct dock_station { acpi_handle handle; unsigned long last_dock_time; u32 flags; - spinlock_t dd_lock; struct mutex hp_lock; struct list_head dependent_devices; @@ -112,10 +111,7 @@ add_dock_dependent_device(struct dock_station *ds, acpi_handle handle) dd->handle = handle; INIT_LIST_HEAD(&dd->list); - - spin_lock(&ds->dd_lock); list_add_tail(&dd->list, &ds->dependent_devices); - spin_unlock(&ds->dd_lock); return 0; } @@ -220,14 +216,10 @@ find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) { struct dock_dependent_device *dd; - spin_lock(&ds->dd_lock); - list_for_each_entry(dd, &ds->dependent_devices, list) { - if (handle == dd->handle) { - spin_unlock(&ds->dd_lock); + list_for_each_entry(dd, &ds->dependent_devices, list) + if (handle == dd->handle) return dd; - } - } - spin_unlock(&ds->dd_lock); + return NULL; } @@ -1005,7 +997,6 @@ static int __init dock_add(acpi_handle handle) dock_station->last_dock_time = jiffies - HZ; mutex_init(&dock_station->hp_lock); - spin_lock_init(&dock_station->dd_lock); INIT_LIST_HEAD(&dock_station->sibling); INIT_LIST_HEAD(&dock_station->dependent_devices); -- cgit v1.2.3-70-g09d2 From d423c083ff3b3adc1e42a2f2c03c8430a6e0220f Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Sat, 29 Jun 2013 00:24:36 +0800 Subject: ACPI / dock: mark initialization functions with __init Mark all initialization functions with __init to reduce runtime memory consumption. Signed-off-by: Jiang Liu Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index 750f958ef0b..f3ec722ae85 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -100,7 +100,7 @@ struct dock_dependent_device { * * Add the dependent device to the dock's dependent device list. */ -static int +static int __init add_dock_dependent_device(struct dock_station *ds, acpi_handle handle) { struct dock_dependent_device *dd; @@ -244,7 +244,7 @@ static int is_dock(acpi_handle handle) return 1; } -static int is_ejectable(acpi_handle handle) +static int __init is_ejectable(acpi_handle handle) { acpi_status status; acpi_handle tmp; @@ -255,7 +255,7 @@ static int is_ejectable(acpi_handle handle) return 1; } -static int is_ata(acpi_handle handle) +static int __init is_ata(acpi_handle handle) { acpi_handle tmp; @@ -268,7 +268,7 @@ static int is_ata(acpi_handle handle) return 0; } -static int is_battery(acpi_handle handle) +static int __init is_battery(acpi_handle handle) { struct acpi_device_info *info; int ret = 1; @@ -284,7 +284,7 @@ static int is_battery(acpi_handle handle) return ret; } -static int is_ejectable_bay(acpi_handle handle) +static int __init is_ejectable_bay(acpi_handle handle) { acpi_handle phandle; @@ -848,7 +848,7 @@ static struct notifier_block dock_acpi_notifier = { * check to see if an object has an _EJD method. If it does, then it * will see if it is dependent on the dock station. */ -static acpi_status +static acpi_status __init find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) { acpi_status status; -- cgit v1.2.3-70-g09d2 From 472d963befe28b8614ea2789757b27536c8d79eb Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Sat, 29 Jun 2013 00:24:37 +0800 Subject: ACPI / dock: simplify dock_create_acpi_device() The return value of dock_create_acpi_device() is not used at all, so change its signature to return void and simplify the implementation of it. Signed-off-by: Jiang Liu Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index f3ec722ae85..1bdb1facc17 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -351,10 +351,8 @@ static int dock_present(struct dock_station *ds) * handle if one does not exist already. This should cause * acpi to scan for drivers for the given devices, and call * matching driver's add routine. - * - * Returns a pointer to the acpi_device corresponding to the handle. */ -static struct acpi_device * dock_create_acpi_device(acpi_handle handle) +static void dock_create_acpi_device(acpi_handle handle) { struct acpi_device *device; int ret; @@ -367,10 +365,7 @@ static struct acpi_device * dock_create_acpi_device(acpi_handle handle) ret = acpi_bus_scan(handle); if (ret) pr_debug("error adding bus, %x\n", -ret); - - acpi_bus_get_device(handle, &device); } - return device; } /** -- cgit v1.2.3-70-g09d2 From c9b5471f8866956919955b70ab27b4737b8bce30 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Sat, 29 Jun 2013 00:24:42 +0800 Subject: ACPI: simplify dock driver with new helper functions Use helper functions introduced previously to simplify the ACPI dock driver. [rjw: Changelog] Signed-off-by: Jiang Liu Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 122 ++++++---------------------------------------------- 1 file changed, 12 insertions(+), 110 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index 1bdb1facc17..810d1d720b1 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -226,48 +226,6 @@ find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) /***************************************************************************** * Dock functions * *****************************************************************************/ -/** - * is_dock - see if a device is a dock station - * @handle: acpi handle of the device - * - * If an acpi object has a _DCK method, then it is by definition a dock - * station, so return true. - */ -static int is_dock(acpi_handle handle) -{ - acpi_status status; - acpi_handle tmp; - - status = acpi_get_handle(handle, "_DCK", &tmp); - if (ACPI_FAILURE(status)) - return 0; - return 1; -} - -static int __init is_ejectable(acpi_handle handle) -{ - acpi_status status; - acpi_handle tmp; - - status = acpi_get_handle(handle, "_EJ0", &tmp); - if (ACPI_FAILURE(status)) - return 0; - return 1; -} - -static int __init is_ata(acpi_handle handle) -{ - acpi_handle tmp; - - if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || - (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || - (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || - (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) - return 1; - - return 0; -} - static int __init is_battery(acpi_handle handle) { struct acpi_device_info *info; @@ -284,17 +242,13 @@ static int __init is_battery(acpi_handle handle) return ret; } -static int __init is_ejectable_bay(acpi_handle handle) +/* Check whether ACPI object is an ejectable battery or disk bay */ +static bool __init is_ejectable_bay(acpi_handle handle) { - acpi_handle phandle; + if (acpi_has_method(handle, "_EJ0") && is_battery(handle)) + return true; - if (!is_ejectable(handle)) - return 0; - if (is_battery(handle) || is_ata(handle)) - return 1; - if (!acpi_get_parent(handle, &phandle) && is_ata(phandle)) - return 1; - return 0; + return acpi_bay_match(handle); } /** @@ -312,7 +266,7 @@ int is_dock_device(acpi_handle handle) if (!dock_station_count) return 0; - if (is_dock(handle)) + if (acpi_dock_match(handle)) return 1; list_for_each_entry(dock_station, &dock_stations, sibling) @@ -446,37 +400,6 @@ static void dock_event(struct dock_station *ds, u32 event, int num) kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); } -/** - * eject_dock - respond to a dock eject request - * @ds: the dock station - * - * This is called after _DCK is called, to execute the dock station's - * _EJ0 method. - */ -static void eject_dock(struct dock_station *ds) -{ - struct acpi_object_list arg_list; - union acpi_object arg; - acpi_status status; - acpi_handle tmp; - - /* all dock devices should have _EJ0, but check anyway */ - status = acpi_get_handle(ds->handle, "_EJ0", &tmp); - if (ACPI_FAILURE(status)) { - pr_debug("No _EJ0 support for dock device\n"); - return; - } - - arg_list.count = 1; - arg_list.pointer = &arg; - arg.type = ACPI_TYPE_INTEGER; - arg.integer.value = 1; - - status = acpi_evaluate_object(ds->handle, "_EJ0", &arg_list, NULL); - if (ACPI_FAILURE(status)) - pr_debug("Failed to evaluate _EJ0!\n"); -} - /** * handle_dock - handle a dock event * @ds: the dock station @@ -537,27 +460,6 @@ static inline void complete_undock(struct dock_station *ds) ds->flags &= ~(DOCK_UNDOCKING); } -static void dock_lock(struct dock_station *ds, int lock) -{ - struct acpi_object_list arg_list; - union acpi_object arg; - acpi_status status; - - arg_list.count = 1; - arg_list.pointer = &arg; - arg.type = ACPI_TYPE_INTEGER; - arg.integer.value = !!lock; - status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); - if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { - if (lock) - acpi_handle_warn(ds->handle, - "Locking device failed (0x%x)\n", status); - else - acpi_handle_warn(ds->handle, - "Unlocking device failed (0x%x)\n", status); - } -} - /** * dock_in_progress - see if we are in the middle of handling a dock event * @ds: the dock station @@ -692,8 +594,8 @@ static int handle_eject_request(struct dock_station *ds, u32 event) hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); undock(ds); - dock_lock(ds, 0); - eject_dock(ds); + acpi_evaluate_lck(ds->handle, 0); + acpi_evaluate_ej0(ds->handle); if (dock_present(ds)) { acpi_handle_err(ds->handle, "Unable to undock!\n"); return -EBUSY; @@ -752,7 +654,7 @@ static void dock_notify(acpi_handle handle, u32 event, void *data) hotplug_dock_devices(ds, event); complete_dock(ds); dock_event(ds, event, DOCK_EVENT); - dock_lock(ds, 1); + acpi_evaluate_lck(ds->handle, 1); acpi_update_all_gpes(); break; } @@ -998,9 +900,9 @@ static int __init dock_add(acpi_handle handle) /* we want the dock device to send uevents */ dev_set_uevent_suppress(&dd->dev, 0); - if (is_dock(handle)) + if (acpi_dock_match(handle)) dock_station->flags |= DOCK_IS_DOCK; - if (is_ata(handle)) + if (acpi_ata_match(handle)) dock_station->flags |= DOCK_IS_ATA; if (is_battery(handle)) dock_station->flags |= DOCK_IS_BAT; @@ -1043,7 +945,7 @@ err_unregister: static __init acpi_status find_dock_and_bay(acpi_handle handle, u32 lvl, void *context, void **rv) { - if (is_dock(handle) || is_ejectable_bay(handle)) + if (acpi_dock_match(handle) || is_ejectable_bay(handle)) dock_add(handle); return AE_OK; -- cgit v1.2.3-70-g09d2 From d460acebd7959cc91e7edc594d90adb9b72a0b05 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 30 Jun 2013 23:42:51 +0200 Subject: ACPI / dock: Drop the hp_lock mutex from struct dock_station The only existing user of the hp_lock mutex in struct dock_station, hotplug_dock_devices(), is always called under acpi_scan_lock and cannot race with another instance of itself, so drop the mutex which is not necessary. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 5 ----- 1 file changed, 5 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index 810d1d720b1..c10761533d6 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -63,7 +63,6 @@ struct dock_station { acpi_handle handle; unsigned long last_dock_time; u32 flags; - struct mutex hp_lock; struct list_head dependent_devices; struct list_head sibling; @@ -351,8 +350,6 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event) { struct dock_dependent_device *dd; - mutex_lock(&ds->hp_lock); - /* * First call driver specific hotplug functions */ @@ -371,7 +368,6 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event) else dock_create_acpi_device(dd->handle); } - mutex_unlock(&ds->hp_lock); } static void dock_event(struct dock_station *ds, u32 event, int num) @@ -893,7 +889,6 @@ static int __init dock_add(acpi_handle handle) dock_station->dock_device = dd; dock_station->last_dock_time = jiffies - HZ; - mutex_init(&dock_station->hp_lock); INIT_LIST_HEAD(&dock_station->sibling); INIT_LIST_HEAD(&dock_station->dependent_devices); -- cgit v1.2.3-70-g09d2 From 96c0a4d4902c3d5f56bde95d3e2d96689ca64b6d Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 30 Jun 2013 23:46:02 +0200 Subject: ACPI / dock: Rework and simplify find_dock_devices() Since acpi_walk_namespace() calls find_dock_devices() during tree pre-order visit, the latter doesn't need to add devices whose parents have _EJD pointing to the docking station to the list of that station's dependent devices, because those parents are going to be added to that list anyway and the removal of a parent will take care of the removal of its children in those cases. For this reason, rework find_dock_devices() to only call add_dock_dependent_device() for devices whose _EJD point directy to the docking station represented by its context argument and simplify it slightly. Signed-off-by: Rafael J. Wysocki Acked-by: Yinghai Lu --- drivers/acpi/dock.c | 23 +++++------------------ 1 file changed, 5 insertions(+), 18 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index c10761533d6..7c86d01346e 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -741,29 +741,16 @@ static struct notifier_block dock_acpi_notifier = { * check to see if an object has an _EJD method. If it does, then it * will see if it is dependent on the dock station. */ -static acpi_status __init -find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) +static acpi_status __init find_dock_devices(acpi_handle handle, u32 lvl, + void *context, void **rv) { - acpi_status status; - acpi_handle tmp, parent; struct dock_station *ds = context; + acpi_handle ejd = NULL; - status = acpi_bus_get_ejd(handle, &tmp); - if (ACPI_FAILURE(status)) { - /* try the parent device as well */ - status = acpi_get_parent(handle, &parent); - if (ACPI_FAILURE(status)) - goto fdd_out; - /* see if parent is dependent on dock */ - status = acpi_bus_get_ejd(parent, &tmp); - if (ACPI_FAILURE(status)) - goto fdd_out; - } - - if (tmp == ds->handle) + acpi_bus_get_ejd(handle, &ejd); + if (ejd == ds->handle) add_dock_dependent_device(ds, handle); -fdd_out: return AE_OK; } -- cgit v1.2.3-70-g09d2 From 37f908778f20bbcc35ab9a98a5b584329c6abf08 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 30 Jun 2013 23:46:42 +0200 Subject: ACPI / dock: Walk list in reverse order during removal of devices If there are indirect dependencies between devices in a dock station's dependent devices list, they may be broken if the devices are removed in the same order in which they have been added. For this reason, make the code in handle_eject_request() walk the list of dependent devices in reverse order. Signed-off-by: Rafael J. Wysocki Acked-by: Yinghai Lu --- drivers/acpi/dock.c | 45 +++++++++++++++++++++++++++++---------------- 1 file changed, 29 insertions(+), 16 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index 7c86d01346e..41c5d04a89c 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -337,9 +337,29 @@ static void dock_remove_acpi_device(acpi_handle handle) } /** - * hotplug_dock_devices - insert or remove devices on the dock station + * hot_remove_dock_devices - Remove dock station devices. + * @ds: Dock station. + */ +static void hot_remove_dock_devices(struct dock_station *ds) +{ + struct dock_dependent_device *dd; + + /* + * Walk the list in reverse order so that devices that have been added + * last are removed first (in case there are some indirect dependencies + * between them). + */ + list_for_each_entry_reverse(dd, &ds->dependent_devices, list) + dock_hotplug_event(dd, ACPI_NOTIFY_EJECT_REQUEST, false); + + list_for_each_entry_reverse(dd, &ds->dependent_devices, list) + dock_remove_acpi_device(dd->handle); +} + +/** + * hotplug_dock_devices - Insert devices on a dock station. * @ds: the dock station - * @event: either bus check or eject request + * @event: either bus check or device check request * * Some devices on the dock station need to have drivers called * to perform hotplug operations after a dock event has occurred. @@ -350,24 +370,17 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event) { struct dock_dependent_device *dd; - /* - * First call driver specific hotplug functions - */ + /* Call driver specific hotplug functions. */ list_for_each_entry(dd, &ds->dependent_devices, list) dock_hotplug_event(dd, event, false); /* - * Now make sure that an acpi_device is created for each - * dependent device, or removed if this is an eject request. - * This will cause acpi_drivers to be stopped/started if they - * exist + * Now make sure that an acpi_device is created for each dependent + * device. That will cause scan handlers to be attached to device + * objects or acpi_drivers to be stopped/started if they are present. */ - list_for_each_entry(dd, &ds->dependent_devices, list) { - if (event == ACPI_NOTIFY_EJECT_REQUEST) - dock_remove_acpi_device(dd->handle); - else - dock_create_acpi_device(dd->handle); - } + list_for_each_entry(dd, &ds->dependent_devices, list) + dock_create_acpi_device(dd->handle); } static void dock_event(struct dock_station *ds, u32 event, int num) @@ -588,7 +601,7 @@ static int handle_eject_request(struct dock_station *ds, u32 event) */ dock_event(ds, event, UNDOCK_EVENT); - hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); + hot_remove_dock_devices(ds); undock(ds); acpi_evaluate_lck(ds->handle, 0); acpi_evaluate_ej0(ds->handle); -- cgit v1.2.3-70-g09d2 From 4ec24065a65b4debfdeb591cc01a4aa092651f53 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 30 Jun 2013 23:47:14 +0200 Subject: ACPI / dock: Simplify dock_init_hotplug() and dock_release_hotplug() Make dock_init_hotplug() and dock_release_hotplug() slightly simpler and move some checks in those functions to the code paths where they are needed. Signed-off-by: Rafael J. Wysocki Acked-by: Yinghai Lu --- drivers/acpi/dock.c | 24 ++++++++---------------- 1 file changed, 8 insertions(+), 16 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index 41c5d04a89c..b1170d60a83 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -130,19 +130,16 @@ static int dock_init_hotplug(struct dock_dependent_device *dd, int ret = 0; mutex_lock(&hotplug_lock); - - if (dd->hp_context) { + if (WARN_ON(dd->hp_context)) { ret = -EEXIST; } else { dd->hp_refcount = 1; dd->hp_ops = ops; dd->hp_context = context; dd->hp_release = release; + if (init) + init(context); } - - if (!WARN_ON(ret) && init) - init(context); - mutex_unlock(&hotplug_lock); return ret; } @@ -157,22 +154,17 @@ static int dock_init_hotplug(struct dock_dependent_device *dd, */ static void dock_release_hotplug(struct dock_dependent_device *dd) { - void (*release)(void *) = NULL; - void *context = NULL; - mutex_lock(&hotplug_lock); - if (dd->hp_context && !--dd->hp_refcount) { + void (*release)(void *) = dd->hp_release; + void *context = dd->hp_context; + dd->hp_ops = NULL; - context = dd->hp_context; dd->hp_context = NULL; - release = dd->hp_release; dd->hp_release = NULL; + if (release) + release(context); } - - if (release && context) - release(context); - mutex_unlock(&hotplug_lock); } -- cgit v1.2.3-70-g09d2 From 59401ccce8729e5c43f9781cc5570da5ca470e27 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 30 Jun 2013 23:48:49 +0200 Subject: ACPI / dock: Rework the handling of notifications The ACPI dock driver uses register_acpi_bus_notifier() which installs a notifier triggered globally for all system notifications. That first of all is inefficient, because the dock driver is only interested in notifications associated with the devices it handles, but it has to handle all system notifies for all devices. Moreover, it does that even if no docking stations are present in the system (CONFIG_ACPI_DOCK set is sufficient for that to happen). Besides, that is inconvenient, because it requires the driver to do extra work for each notification to find the target dock station object. For these reasons, rework the dock driver to install a notify handler individually for each dock station in the system using acpi_install_notify_handler(). This allows the dock station object to be passed directly to the notify handler and makes it possible to simplify the dock driver quite a bit. It also reduces the overhead related to the handling of all system notifies when CONFIG_ACPI_DOCK is set. Signed-off-by: Rafael J. Wysocki Acked-by: Yinghai Lu --- drivers/acpi/dock.c | 67 +++++++++++++++++++---------------------------------- 1 file changed, 24 insertions(+), 43 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index b1170d60a83..a326c7993f4 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -607,18 +607,17 @@ static int handle_eject_request(struct dock_station *ds, u32 event) /** * dock_notify - act upon an acpi dock notification - * @handle: the dock station handle + * @ds: dock station * @event: the acpi event - * @data: our driver data struct * * If we are notified to dock, then check to see if the dock is * present and then dock. Notify all drivers of the dock event, * and then hotplug and devices that may need hotplugging. */ -static void dock_notify(acpi_handle handle, u32 event, void *data) +static void dock_notify(struct dock_station *ds, u32 event) { - struct dock_station *ds = data; - struct acpi_device *tmp; + acpi_handle handle = ds->handle; + struct acpi_device *ad; int surprise_removal = 0; /* @@ -641,8 +640,7 @@ static void dock_notify(acpi_handle handle, u32 event, void *data) switch (event) { case ACPI_NOTIFY_BUS_CHECK: case ACPI_NOTIFY_DEVICE_CHECK: - if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, - &tmp)) { + if (!dock_in_progress(ds) && acpi_bus_get_device(handle, &ad)) { begin_dock(ds); dock(ds); if (!dock_present(ds)) { @@ -679,9 +677,8 @@ static void dock_notify(acpi_handle handle, u32 event, void *data) } struct dock_data { - acpi_handle handle; - unsigned long event; struct dock_station *ds; + u32 event; }; static void acpi_dock_deferred_cb(void *context) @@ -689,52 +686,31 @@ static void acpi_dock_deferred_cb(void *context) struct dock_data *data = context; acpi_scan_lock_acquire(); - dock_notify(data->handle, data->event, data->ds); + dock_notify(data->ds, data->event); acpi_scan_lock_release(); kfree(data); } -static int acpi_dock_notifier_call(struct notifier_block *this, - unsigned long event, void *data) +static void dock_notify_handler(acpi_handle handle, u32 event, void *data) { - struct dock_station *dock_station; - acpi_handle handle = data; + struct dock_data *dd; if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK && event != ACPI_NOTIFY_EJECT_REQUEST) - return 0; - - acpi_scan_lock_acquire(); - - list_for_each_entry(dock_station, &dock_stations, sibling) { - if (dock_station->handle == handle) { - struct dock_data *dd; - acpi_status status; - - dd = kmalloc(sizeof(*dd), GFP_KERNEL); - if (!dd) - break; + return; - dd->handle = handle; - dd->event = event; - dd->ds = dock_station; - status = acpi_os_hotplug_execute(acpi_dock_deferred_cb, - dd); - if (ACPI_FAILURE(status)) - kfree(dd); + dd = kmalloc(sizeof(*dd), GFP_KERNEL); + if (dd) { + acpi_status status; - break; - } + dd->ds = data; + dd->event = event; + status = acpi_os_hotplug_execute(acpi_dock_deferred_cb, dd); + if (ACPI_FAILURE(status)) + kfree(dd); } - - acpi_scan_lock_release(); - return 0; } -static struct notifier_block dock_acpi_notifier = { - .notifier_call = acpi_dock_notifier_call, -}; - /** * find_dock_devices - find devices on the dock station * @handle: the handle of the device we are examining @@ -868,6 +844,7 @@ static int __init dock_add(acpi_handle handle) int ret, id; struct dock_station ds, *dock_station; struct platform_device *dd; + acpi_status status; id = dock_station_count; memset(&ds, 0, sizeof(ds)); @@ -908,6 +885,11 @@ static int __init dock_add(acpi_handle handle) if (ret) goto err_rmgroup; + status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, + dock_notify_handler, dock_station); + if (ACPI_FAILURE(status)) + goto err_rmgroup; + dock_station_count++; list_add(&dock_station->sibling, &dock_stations); return 0; @@ -953,7 +935,6 @@ void __init acpi_dock_init(void) } ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); - register_acpi_bus_notifier(&dock_acpi_notifier); pr_info(PREFIX "%s: %d docks/bays found\n", ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); } -- cgit v1.2.3-70-g09d2 From a30c4c5ee85680bb66ed8a6c0b0bf4921125c378 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 30 Jun 2013 23:50:24 +0200 Subject: ACPI / dock: Do not leak memory on falilures to add a dock station The function creating and registering dock station objects, dock_add(), leaks memory if there's an error after it's walked the ACPI namespace calling find_dock_devices(), because it doesn't free the list of dependent devices it's just created in those cases. Fix that issue by adding the missing code to free the list of dependent devices on errors. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index a326c7993f4..3e20b13fa27 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -115,6 +115,16 @@ add_dock_dependent_device(struct dock_station *ds, acpi_handle handle) return 0; } +static void remove_dock_dependent_devices(struct dock_station *ds) +{ + struct dock_dependent_device *dd, *aux; + + list_for_each_entry_safe(dd, aux, &ds->dependent_devices, list) { + list_del(&dd->list); + kfree(dd); + } +} + /** * dock_init_hotplug - Initialize a hotplug device on a docking station. * @dd: Dock-dependent device. @@ -895,6 +905,7 @@ static int __init dock_add(acpi_handle handle) return 0; err_rmgroup: + remove_dock_dependent_devices(dock_station); sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group); err_unregister: platform_device_unregister(dd); -- cgit v1.2.3-70-g09d2 From f09ce741a03ad7de591aa47e760fbeee28567b63 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 5 Jul 2013 03:03:25 +0200 Subject: ACPI / dock / PCI: Drop ACPI dock notifier chain The only user of the ACPI dock notifier chain is the ACPI-based PCI hotplug (acpiphp) driver that uses it to carry out post-dock fixups needed by some systems with broken _DCK. However, it is not necessary to use a separate notifier chain for that, as it can be simply replaced with a new callback in struct acpi_dock_ops. For this reason, add a new .fixup() callback to struct acpi_dock_ops and make hotplug_dock_devices() execute it for all dock devices with hotplug operations registered. Accordingly, make acpiphp point that callback to the function carrying out the post-dock fixups and do not register a separate dock notifier for each device registering dock operations. Finally, drop the ACPI dock notifier chain that has no more users. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 66 +++++++++++++++----------------------- drivers/pci/hotplug/acpiphp.h | 1 - drivers/pci/hotplug/acpiphp_glue.c | 18 +++-------- include/acpi/acpi_drivers.h | 10 +----- 4 files changed, 30 insertions(+), 65 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index 3e20b13fa27..c89a9c3b48b 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -51,8 +51,6 @@ MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " " the driver to wait for userspace to write the undock sysfs file " " before undocking"); -static struct atomic_notifier_head dock_notifier_list; - static const struct acpi_device_id dock_device_ids[] = { {"LNXDOCK", 0}, {"", 0}, @@ -89,6 +87,12 @@ struct dock_dependent_device { #define DOCK_EVENT 3 #define UNDOCK_EVENT 2 +enum dock_callback_type { + DOCK_CALL_HANDLER, + DOCK_CALL_FIXUP, + DOCK_CALL_UEVENT, +}; + /***************************************************************************** * Dock Dependent device functions * *****************************************************************************/ @@ -179,7 +183,7 @@ static void dock_release_hotplug(struct dock_dependent_device *dd) } static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event, - bool uevent) + enum dock_callback_type cb_type) { acpi_notify_handler cb = NULL; bool run = false; @@ -189,8 +193,18 @@ static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event, if (dd->hp_context) { run = true; dd->hp_refcount++; - if (dd->hp_ops) - cb = uevent ? dd->hp_ops->uevent : dd->hp_ops->handler; + if (dd->hp_ops) { + switch (cb_type) { + case DOCK_CALL_FIXUP: + cb = dd->hp_ops->fixup; + break; + case DOCK_CALL_UEVENT: + cb = dd->hp_ops->uevent; + break; + default: + cb = dd->hp_ops->handler; + } + } } mutex_unlock(&hotplug_lock); @@ -372,9 +386,13 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event) { struct dock_dependent_device *dd; + /* Call driver specific post-dock fixups. */ + list_for_each_entry(dd, &ds->dependent_devices, list) + dock_hotplug_event(dd, event, DOCK_CALL_FIXUP); + /* Call driver specific hotplug functions. */ list_for_each_entry(dd, &ds->dependent_devices, list) - dock_hotplug_event(dd, event, false); + dock_hotplug_event(dd, event, DOCK_CALL_HANDLER); /* * Now make sure that an acpi_device is created for each dependent @@ -405,7 +423,7 @@ static void dock_event(struct dock_station *ds, u32 event, int num) kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); list_for_each_entry(dd, &ds->dependent_devices, list) - dock_hotplug_event(dd, event, true); + dock_hotplug_event(dd, event, DOCK_CALL_UEVENT); if (num != DOCK_EVENT) kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); @@ -487,37 +505,6 @@ static int dock_in_progress(struct dock_station *ds) return 0; } -/** - * register_dock_notifier - add yourself to the dock notifier list - * @nb: the callers notifier block - * - * If a driver wishes to be notified about dock events, they can - * use this function to put a notifier block on the dock notifier list. - * this notifier call chain will be called after a dock event, but - * before hotplugging any new devices. - */ -int register_dock_notifier(struct notifier_block *nb) -{ - if (!dock_station_count) - return -ENODEV; - - return atomic_notifier_chain_register(&dock_notifier_list, nb); -} -EXPORT_SYMBOL_GPL(register_dock_notifier); - -/** - * unregister_dock_notifier - remove yourself from the dock notifier list - * @nb: the callers notifier block - */ -void unregister_dock_notifier(struct notifier_block *nb) -{ - if (!dock_station_count) - return; - - atomic_notifier_chain_unregister(&dock_notifier_list, nb); -} -EXPORT_SYMBOL_GPL(unregister_dock_notifier); - /** * register_hotplug_dock_device - register a hotplug function * @handle: the handle of the device @@ -658,8 +645,6 @@ static void dock_notify(struct dock_station *ds, u32 event) complete_dock(ds); break; } - atomic_notifier_call_chain(&dock_notifier_list, - event, NULL); hotplug_dock_devices(ds, event); complete_dock(ds); dock_event(ds, event, DOCK_EVENT); @@ -945,7 +930,6 @@ void __init acpi_dock_init(void) return; } - ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); pr_info(PREFIX "%s: %d docks/bays found\n", ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); } diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h index 6fdd49c6f0b..6c781edabcc 100644 --- a/drivers/pci/hotplug/acpiphp.h +++ b/drivers/pci/hotplug/acpiphp.h @@ -122,7 +122,6 @@ struct acpiphp_func { struct acpiphp_slot *slot; /* parent */ struct list_head sibling; - struct notifier_block nb; acpi_handle handle; u8 function; /* pci function# */ diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index a0a7133a1d1..8bfad0dc29a 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -119,15 +119,14 @@ static void free_bridge(struct kref *kref) * TBD - figure out a way to only call fixups for * systems that require them. */ -static int post_dock_fixups(struct notifier_block *nb, unsigned long val, - void *v) +static void post_dock_fixups(acpi_handle not_used, u32 event, void *data) { - struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb); + struct acpiphp_func *func = data; struct pci_bus *bus = func->slot->bridge->pci_bus; u32 buses; if (!bus->self) - return NOTIFY_OK; + return; /* fixup bad _DCK function that rewrites * secondary bridge on slot @@ -143,11 +142,11 @@ static int post_dock_fixups(struct notifier_block *nb, unsigned long val, | ((unsigned int)(bus->busn_res.end) << 16); pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); } - return NOTIFY_OK; } static const struct acpi_dock_ops acpiphp_dock_ops = { + .fixup = post_dock_fixups, .handler = hotplug_event_func, }; @@ -315,14 +314,6 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) &acpiphp_dock_ops, newfunc, acpiphp_dock_init, acpiphp_dock_release)) dbg("failed to register dock device\n"); - - /* we need to be notified when dock events happen - * outside of the hotplug operation, since we may - * need to do fixups before we can hotplug. - */ - newfunc->nb.notifier_call = post_dock_fixups; - if (register_dock_notifier(&newfunc->nb)) - dbg("failed to register a dock notifier"); } /* install notify handler */ @@ -472,7 +463,6 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge) list_for_each_entry(func, &slot->funcs, sibling) { if (is_dock_device(func->handle)) { unregister_hotplug_dock_device(func->handle); - unregister_dock_notifier(&func->nb); } if (!(func->flags & FUNC_HAS_DCK)) { status = acpi_remove_notify_handler(func->handle, diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h index 0cf85786ed2..1cedfcb1bd8 100644 --- a/include/acpi/acpi_drivers.h +++ b/include/acpi/acpi_drivers.h @@ -113,14 +113,13 @@ void pci_acpi_crs_quirks(void); Dock Station -------------------------------------------------------------------------- */ struct acpi_dock_ops { + acpi_notify_handler fixup; acpi_notify_handler handler; acpi_notify_handler uevent; }; #ifdef CONFIG_ACPI_DOCK extern int is_dock_device(acpi_handle handle); -extern int register_dock_notifier(struct notifier_block *nb); -extern void unregister_dock_notifier(struct notifier_block *nb); extern int register_hotplug_dock_device(acpi_handle handle, const struct acpi_dock_ops *ops, void *context, @@ -132,13 +131,6 @@ static inline int is_dock_device(acpi_handle handle) { return 0; } -static inline int register_dock_notifier(struct notifier_block *nb) -{ - return -ENODEV; -} -static inline void unregister_dock_notifier(struct notifier_block *nb) -{ -} static inline int register_hotplug_dock_device(acpi_handle handle, const struct acpi_dock_ops *ops, void *context, -- cgit v1.2.3-70-g09d2 From 2efbca4dfc7b43951de6dd1647f9eebda9d4372b Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 5 Jul 2013 03:23:36 +0200 Subject: ACPI / dock: Drop unnecessary local variable from dock_add() The local variable id in dock_add() is not necessary, so drop it. While we're at it, use an initializer to clear the local variable ds and drop the memset() used for this purpose. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index c89a9c3b48b..f601658a4ad 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -836,14 +836,13 @@ static struct attribute_group dock_attribute_group = { */ static int __init dock_add(acpi_handle handle) { - int ret, id; - struct dock_station ds, *dock_station; + struct dock_station *dock_station, ds = { NULL, }; struct platform_device *dd; acpi_status status; + int ret; - id = dock_station_count; - memset(&ds, 0, sizeof(ds)); - dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds)); + dd = platform_device_register_data(NULL, "dock", dock_station_count, + &ds, sizeof(ds)); if (IS_ERR(dd)) return PTR_ERR(dd); -- cgit v1.2.3-70-g09d2 From 0177f29fea534ef5e6af2d76e9a9be0fdd325c4d Mon Sep 17 00:00:00 2001 From: Wei Yongjun Date: Wed, 17 Jul 2013 08:33:25 +0800 Subject: ACPI / dock: fix error return code in dock_add() Fix to return -ENODEV in the acpi notify handler install error handling case instead of 0, as done elsewhere in this function. Signed-off-by: Wei Yongjun Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index f601658a4ad..b527c1bd8bb 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -881,8 +881,10 @@ static int __init dock_add(acpi_handle handle) status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, dock_notify_handler, dock_station); - if (ACPI_FAILURE(status)) + if (ACPI_FAILURE(status)) { + ret = -ENODEV; goto err_rmgroup; + } dock_station_count++; list_add(&dock_station->sibling, &dock_stations); -- cgit v1.2.3-70-g09d2 From 027951e5650eefffa4d9fffad561468ea77ededa Mon Sep 17 00:00:00 2001 From: Hanjun Guo Date: Tue, 13 Aug 2013 18:31:13 +0800 Subject: ACPI / dock: Fix __init attribute location in find_dock_and_bay() __init belongs after the return type on functions, not before it. Signed-off-by: Hanjun Guo Signed-off-by: Rafael J. Wysocki --- drivers/acpi/dock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/acpi/dock.c') diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index 82656075338..c90112ceb57 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -1055,7 +1055,7 @@ err_unregister: * * This is called by acpi_walk_namespace to look for dock stations and bays. */ -static __init acpi_status +static acpi_status __init find_dock_and_bay(acpi_handle handle, u32 lvl, void *context, void **rv) { if (is_dock(handle) || is_ejectable_bay(handle)) -- cgit v1.2.3-70-g09d2