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| author | Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com> | 2016-04-25 23:31:57 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-07 17:21:57 -0700 |
| commit | 70d7df0f978736017d85d8fad91c56231d816249 (patch) | |
| tree | 9fbc82dc17d7cecaf6d6ca27b970f80d54af3776 /drivers | |
| parent | 4b7bac82604956ecda33c48bdbfb33ca37b7f632 (diff) | |
| download | lwn-70d7df0f978736017d85d8fad91c56231d816249.tar.gz lwn-70d7df0f978736017d85d8fad91c56231d816249.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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -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()) |