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authorStefan Haberland <stefan.haberland@de.ibm.com>2011-01-05 12:48:05 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2011-01-05 12:47:30 +0100
commit6f272b9cec285a9610a2acf101f694bc58bed37e (patch)
tree5c333d47bfaefa34ccd827744f35381133f4444b /drivers/s390
parent5a27e60dec59a95bd7f8ae9a19ae2ede4f76395b (diff)
[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>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/block/dasd.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index f16afe74464..82d9ce36bd0 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2769,6 +2769,10 @@ int dasd_generic_pm_freeze(struct ccw_device *cdev)
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 @@ int dasd_generic_pm_freeze(struct ccw_device *cdev)
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;
}