[PATCH 5.10 095/193] scsi: megaraid_sas: Increase register read retry rount from 3 to 30 for selected registers

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chandrakanth patil <chandrakanth.patil@xxxxxxxxxxxx>

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@xxxxxxxxxxxx
Fixes: 272652fcbf1a ("scsi: megaraid_sas: add retry logic in megasas_readl")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Chandrakanth patil <chandrakanth.patil@xxxxxxxxxxxx>
Signed-off-by: Sumit Saxena <sumit.saxena@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231003110021.168862-2-chandrakanth.patil@xxxxxxxxxxxx
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/scsi/megaraid/megaraid_sas_base.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -248,13 +248,13 @@ u32 megasas_readl(struct megasas_instanc
 	 * 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);






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