This is a note to let you know that I've just added the patch titled
scsi: megaraid_sas: Increase register read retry rount from 3 to 30 for selected registers
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-megaraid_sas-increase-register-read-retry-rount-from-3-to-30-for-selected-registers.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8e3ed9e786511ad800c33605ed904b9de49323cf Mon Sep 17 00:00:00 2001
From: Chandrakanth patil <chandrakanth.patil@xxxxxxxxxxxx>
Date: Tue, 3 Oct 2023 16:30:18 +0530
Subject: scsi: megaraid_sas: Increase register read retry rount from 3 to 30 for selected registers
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
@@ -263,13 +263,13 @@ 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);
Patches currently in stable-queue which might be from chandrakanth.patil@xxxxxxxxxxxx are
queue-6.1/scsi-megaraid_sas-increase-register-read-retry-rount-from-3-to-30-for-selected-registers.patch
