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scsi: mpt3sas: Improve device discovery and readiness handling for slow devices

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Introduce a new module parameter "issue_scsi_cmd_to_bringup_drive"
(default=1) which allows overriding the driver's behavior of issuing
SCSI TEST_UNIT_READY/START_UNIT commands to bring devices to READY state
during unblock.

Improve device discovery and I/O unblocking reliability by adding
robust device readiness checks and separate callback handling for
discovery I/O.  This introduces new helper routines for SCSI command
execution and readiness determination, ensuring smoother recovery and
initialization for slow or transient devices.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202510310924.crvtELzs-lkp@intel.com/
Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Link: https://patch.msgid.link/20251113153712.31850-4-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ranjan Kumar 2025-11-13 21:07:06 +05:30 • committed by Martin K. Petersen
commit aee682fad6
3 changed files with 1119 additions and 17 deletions
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