diff options
author | Chandrakanth patil <chandrakanth.patil@broadcom.com> | 2023-10-03 16:30:18 +0530 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-28 16:50:18 +0000 |
commit | acbc12b0b348d7633dde82c566f80916e6806f2d (patch) | |
tree | 2111ed1655393e45d7191f899c7930ca3c03f2f6 /drivers/scsi/megaraid | |
parent | bae690510316bc00207ae24dc0146c0447d0e6a4 (diff) |
scsi: megaraid_sas: Increase register read retry rount from 3 to 30 for selected registers
commit 8e3ed9e786511ad800c33605ed904b9de49323cf upstream.
In BMC environments with concurrent access to multiple registers, certain
registers occasionally yield a value of 0 even after 3 retries due to
hardware errata. As a fix, we have extended the retry count from 3 to 30.
The same errata applies to the mpt3sas driver, and a similar patch has
been accepted. Please find more details in the mpt3sas patch reference
link.
Link: https://lore.kernel.org/r/20230829090020.5417-2-ranjan.kumar@broadcom.com
Fixes: 272652fcbf1a ("scsi: megaraid_sas: add retry logic in megasas_readl")
Cc: stable@vger.kernel.org
Signed-off-by: Chandrakanth patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Link: https://lore.kernel.org/r/20231003110021.168862-2-chandrakanth.patil@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/scsi/megaraid')
-rw-r--r-- | drivers/scsi/megaraid/megaraid_sas_base.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index c4b9762f19ee..603c99fcb74e 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -252,13 +252,13 @@ u32 megasas_readl(struct megasas_instance *instance, * Fusion registers could intermittently return all zeroes. * This behavior is transient in nature and subsequent reads will * return valid value. As a workaround in driver, retry readl for - * upto three times until a non-zero value is read. + * up to thirty times until a non-zero value is read. */ if (instance->adapter_type == AERO_SERIES) { do { ret_val = readl(addr); i++; - } while (ret_val == 0 && i < 3); + } while (ret_val == 0 && i < 30); return ret_val; } else { return readl(addr); |