mpt2sas, mpt3sas: Fail the host reset initiated due to discovery related I/O timeouts...
authorSreekanth Reddy <sreekanth.reddy@avagotech.com>
Mon, 12 Jan 2015 06:08:57 +0000 (11:38 +0530)
committerChristoph Hellwig <hch@lst.de>
Tue, 13 Jan 2015 15:27:24 +0000 (16:27 +0100)
commitddb588bebeab4606c8b14f952bfd16f2f8864dda
tree2eec211cfea408ec52b83cad595219da214a209a
parent2d8ce8c9d4b25b88eb4aa6bc52492eb7e0ae1dab
mpt2sas, mpt3sas: Fail the host reset initiated due to discovery related I/O timeouts at driver load time

When a flaky disk is there in a topology then during driver load,
discovery related I/O times out; which results in SCSI error recovery
initiating host reset and then the controller won't see any disk.

In this patch, The driver would return FAILED status to the host reset
initiated due to discovery related I/O timeout if ioc->is_driver_loading
is set. This flag would be set until we exit out of scsih_scan_finished().
i.e.
During device discovery if one of the disk is flaky
(which responds to some discovery commands and doesn't respond to some)
the driver wouldn't perform host reset for discovery related I/O timeout.
Instead it would return Failure for the host reset resulting in the
flaky disk getting removed by the SCSI Mid layer,
so other disks would be added correctly.

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
drivers/scsi/mpt2sas/mpt2sas_scsih.c
drivers/scsi/mpt3sas/mpt3sas_scsih.c