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| author | Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com> | 2016-04-25 23:31:57 -0700 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2016-06-15 09:32:12 +0200 |
| commit | 4c65ba338bd3b6cea461cfbe3f000323bc22105c (patch) | |
| tree | 130c24e5d570653de49cee4bd0fb46d9f2e6cfe9 /drivers/scsi | |
| parent | 43ca60457b15da343097c28d53eb6178bd7dd14c (diff) | |
| download | lwn-4c65ba338bd3b6cea461cfbe3f000323bc22105c.tar.gz lwn-4c65ba338bd3b6cea461cfbe3f000323bc22105c.zip | |
aacraid: Fix for aac_command_thread hang
commit fc4bf75ea300a5e62a2419f89dd0e22189dd7ab7 upstream.
Typically under error conditions, it is possible for aac_command_thread()
to miss the wakeup from kthread_stop() and go back to sleep, causing it
to hang aac_shutdown.
In the observed scenario, the adapter is not functioning correctly and so
aac_fib_send() never completes (or time-outs depending on how it was
called). Shortly after aac_command_thread() starts it performs
aac_fib_send(SendHostTime) which hangs. When aac_probe_one
/aac_get_adapter_info send time outs, kthread_stop is called which breaks
the command thread out of it's hang.
The code will still go back to sleep in schedule_timeout() without
checking kthread_should_stop() so it causes aac_probe_one to hang until
the schedule_timeout() which is 30 minutes.
Fixed by: Adding another kthread_should_stop() before schedule_timeout()
Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/aacraid/commsup.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c index 06f73d2c878c..ce177a50ec05 100644 --- a/drivers/scsi/aacraid/commsup.c +++ b/drivers/scsi/aacraid/commsup.c @@ -1921,6 +1921,10 @@ int aac_command_thread(void *data) if (difference <= 0) difference = 1; set_current_state(TASK_INTERRUPTIBLE); + + if (kthread_should_stop()) + break; + schedule_timeout(difference); if (kthread_should_stop()) |