[S390] dasd: Prevent deadlock during suspend/resume.
The freeze callback may set a stop bit so that a worker thread could
not start I/O. The discipline specific freeze function waits for the
worker to be completed.
Set the stop_bit after the discipline specific freeze function has
returned and no worker is running.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index f16afe7..82d9ce3 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2769,6 +2769,10 @@
if (IS_ERR(device))
return PTR_ERR(device);
+
+ if (device->discipline->freeze)
+ rc = device->discipline->freeze(device);
+
/* disallow new I/O */
dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
/* clear active requests */
@@ -2805,9 +2809,6 @@
list_splice_tail(&freeze_queue, &device->ccw_queue);
spin_unlock_irq(get_ccwdev_lock(cdev));
- if (device->discipline->freeze)
- rc = device->discipline->freeze(device);
-
dasd_put_device(device);
return rc;
}