scsi: mpt3sas: Perform additional retries if doorbell read returns 0

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commit 4ca10f3e31 upstream.

The driver retries certain register reads 3 times if the returned value is
0. This was done because the controller could return 0 for certain
registers if other registers were being accessed concurrently by the BMC.

In certain systems with increased BMC interactions, the register values
returned can be 0 for longer than 3 retries. Change the retry count from 3
to 30 for the affected registers to prevent problems with out-of-band
management.

Fixes: b899202901 ("scsi: mpt3sas: Add separate function for aero doorbell reads")
Cc: stable@vger.kernel.org
Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Link: https://lore.kernel.org/r/20230829090020.5417-2-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Ranjan Kumar 2023-08-29 14:30:19 +05:30 • committed by Greg Kroah-Hartman

parent 6c4f87e523

commit 316f398429

2 changed files with 34 additions and 13 deletions

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46

drivers/scsi/mpt3sas/mpt3sas_base.c

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1

drivers/scsi/mpt3sas/mpt3sas_base.h

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