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authorOliver Neukum <oliver@neukum.org>2010-02-27 20:56:47 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-03-19 07:24:17 -0700
commitd93d16e9aa58887feadd999ea26b7b8139e98b56 (patch)
tree47cd5e95bee9ccd52aa5ccfff4c87af78d605ad7 /drivers/usb/class
parent62e6685470fb04fb7688ecef96c39160498721d5 (diff)
usb: cdc-wdm: Fix order in disconnect and fix locking
- as the callback can schedule work, URBs must be killed first - if the driver causes an autoresume, the caller must handle locking Signed-off-by: Oliver Neukum <neukum@b1-systems.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/class')
-rw-r--r--drivers/usb/class/cdc-wdm.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 07c12974fe1..b5749050886 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -776,9 +776,9 @@ static void wdm_disconnect(struct usb_interface *intf)
/* to terminate pending flushes */
clear_bit(WDM_IN_USE, &desc->flags);
spin_unlock_irqrestore(&desc->iuspin, flags);
- cancel_work_sync(&desc->rxwork);
mutex_lock(&desc->lock);
kill_urbs(desc);
+ cancel_work_sync(&desc->rxwork);
mutex_unlock(&desc->lock);
wake_up_all(&desc->wait);
if (!desc->count)
@@ -786,6 +786,7 @@ static void wdm_disconnect(struct usb_interface *intf)
mutex_unlock(&wdm_mutex);
}
+#ifdef CONFIG_PM
static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
{
struct wdm_device *desc = usb_get_intfdata(intf);
@@ -793,27 +794,30 @@ static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor);
- mutex_lock(&desc->lock);
+ /* if this is an autosuspend the caller does the locking */
+ if (!(message.event & PM_EVENT_AUTO))
+ mutex_lock(&desc->lock);
spin_lock_irq(&desc->iuspin);
-#ifdef CONFIG_PM
+
if ((message.event & PM_EVENT_AUTO) &&
(test_bit(WDM_IN_USE, &desc->flags)
|| test_bit(WDM_RESPONDING, &desc->flags))) {
spin_unlock_irq(&desc->iuspin);
rv = -EBUSY;
} else {
-#endif
+
set_bit(WDM_SUSPENDING, &desc->flags);
spin_unlock_irq(&desc->iuspin);
- cancel_work_sync(&desc->rxwork);
+ /* callback submits work - order is essential */
kill_urbs(desc);
-#ifdef CONFIG_PM
+ cancel_work_sync(&desc->rxwork);
}
-#endif
- mutex_unlock(&desc->lock);
+ if (!(message.event & PM_EVENT_AUTO))
+ mutex_unlock(&desc->lock);
return rv;
}
+#endif
static int recover_from_urb_loss(struct wdm_device *desc)
{
@@ -827,6 +831,8 @@ static int recover_from_urb_loss(struct wdm_device *desc)
}
return rv;
}
+
+#ifdef CONFIG_PM
static int wdm_resume(struct usb_interface *intf)
{
struct wdm_device *desc = usb_get_intfdata(intf);
@@ -839,6 +845,7 @@ static int wdm_resume(struct usb_interface *intf)
mutex_unlock(&desc->lock);
return rv;
}
+#endif
static int wdm_pre_reset(struct usb_interface *intf)
{
@@ -862,9 +869,11 @@ static struct usb_driver wdm_driver = {
.name = "cdc_wdm",
.probe = wdm_probe,
.disconnect = wdm_disconnect,
+#ifdef CONFIG_PM
.suspend = wdm_suspend,
.resume = wdm_resume,
.reset_resume = wdm_resume,
+#endif
.pre_reset = wdm_pre_reset,
.post_reset = wdm_post_reset,
.id_table = wdm_ids,