mpt3sas: Don't block the drive when drive addition under the control of SML
authorSreekanth Reddy <sreekanth.reddy@avagotech.com>
Tue, 30 Jun 2015 06:54:49 +0000 (12:24 +0530)
committerJames Bottomley <JBottomley@Odin.com>
Thu, 27 Aug 2015 18:08:23 +0000 (11:08 -0700)
commite4bc7f5c21a18cab9acd30940df0ee791fcd7b9e
tree175c15c1b6f985bfc566bc049e79377e5020e146
parent4dc8c8087f0304ff8d06f862520406b11aac4a66
mpt3sas: Don't block the drive when drive addition under the control of SML

During hot-plugging of a disk(having a flaky link), the disk addition
stops and any further disk addition or removal doesn't happen on that
controller.

This is because, when driver receives DELAY_NOT_RESPONDING event for a disk
while it is undergoing addition at the SCSI Transport layer, the driver
would block the I/O to that disk resulting in a deadlock. i.e the disk
addition work couldn't be completed at the SCSI Transport Layer as it
can't send any I/Os (such as Inquiry, Report LUNs etc) to the disk as
I/Os are blocked to this drive. Also any subsequent device removal
(TARGET_NOT_RESPONDING) or link update(RC_PHY_CHANGED) event couldn't be
processed as they are in the queue to get processed after disk addition
event.

Description of Change:
Don't block the drive when drive addition is under the control of SML.
So that SML won't be blocked of issuing the device dicovery commands
(such as Inquiry, Report LUNs etc).

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
drivers/scsi/mpt3sas/mpt3sas_base.h
drivers/scsi/mpt3sas/mpt3sas_scsih.c
drivers/scsi/mpt3sas/mpt3sas_transport.c