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path: root/drivers/s390/crypto/ap_bus.c
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Diffstat (limited to 'drivers/s390/crypto/ap_bus.c')
-rw-r--r--drivers/s390/crypto/ap_bus.c40
1 files changed, 29 insertions, 11 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 090b32a339c..1294876bf7b 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -60,6 +60,7 @@ static int ap_device_probe(struct device *dev);
static void ap_interrupt_handler(void *unused1, void *unused2);
static void ap_reset(struct ap_device *ap_dev);
static void ap_config_timeout(unsigned long ptr);
+static int ap_select_domain(void);
/*
* Module description.
@@ -109,6 +110,10 @@ static unsigned long long poll_timeout = 250000;
/* Suspend flag */
static int ap_suspend_flag;
+/* Flag to check if domain was set through module parameter domain=. This is
+ * important when supsend and resume is done in a z/VM environment where the
+ * domain might change. */
+static int user_set_domain = 0;
static struct bus_type ap_bus_type;
/**
@@ -643,6 +648,7 @@ static int ap_bus_suspend(struct device *dev, pm_message_t state)
destroy_workqueue(ap_work_queue);
ap_work_queue = NULL;
}
+
tasklet_disable(&ap_tasklet);
}
/* Poll on the device until all requests are finished. */
@@ -653,7 +659,10 @@ static int ap_bus_suspend(struct device *dev, pm_message_t state)
spin_unlock_bh(&ap_dev->lock);
} while ((flags & 1) || (flags & 2));
- ap_device_remove(dev);
+ spin_lock_bh(&ap_dev->lock);
+ ap_dev->unregistered = 1;
+ spin_unlock_bh(&ap_dev->lock);
+
return 0;
}
@@ -666,11 +675,10 @@ static int ap_bus_resume(struct device *dev)
ap_suspend_flag = 0;
if (!ap_interrupts_available())
ap_interrupt_indicator = NULL;
- ap_device_probe(dev);
- ap_reset(ap_dev);
- setup_timer(&ap_dev->timeout, ap_request_timeout,
- (unsigned long) ap_dev);
- ap_scan_bus(NULL);
+ if (!user_set_domain) {
+ ap_domain_index = -1;
+ ap_select_domain();
+ }
init_timer(&ap_config_timer);
ap_config_timer.function = ap_config_timeout;
ap_config_timer.data = 0;
@@ -686,12 +694,14 @@ static int ap_bus_resume(struct device *dev)
tasklet_schedule(&ap_tasklet);
if (ap_thread_flag)
rc = ap_poll_thread_start();
- } else {
- ap_device_probe(dev);
- ap_reset(ap_dev);
- setup_timer(&ap_dev->timeout, ap_request_timeout,
- (unsigned long) ap_dev);
}
+ if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) {
+ spin_lock_bh(&ap_dev->lock);
+ ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid),
+ ap_domain_index);
+ spin_unlock_bh(&ap_dev->lock);
+ }
+ queue_work(ap_work_queue, &ap_config_work);
return rc;
}
@@ -1079,6 +1089,8 @@ static void ap_scan_bus(struct work_struct *unused)
spin_lock_bh(&ap_dev->lock);
if (rc || ap_dev->unregistered) {
spin_unlock_bh(&ap_dev->lock);
+ if (ap_dev->unregistered)
+ i--;
device_unregister(dev);
put_device(dev);
continue;
@@ -1586,6 +1598,12 @@ int __init ap_module_init(void)
ap_domain_index);
return -EINVAL;
}
+ /* In resume callback we need to know if the user had set the domain.
+ * If so, we can not just reset it.
+ */
+ if (ap_domain_index >= 0)
+ user_set_domain = 1;
+
if (ap_instructions_available() != 0) {
pr_warning("The hardware system does not support "
"AP instructions\n");