From: Chandrakanth patil Date: Tue, 3 Oct 2023 11:00:18 +0000 (+0530) Subject: scsi: megaraid_sas: Increase register read retry rount from 3 to 30 for selected... X-Git-Tag: v6.6.7~775 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ad347c46384b9b95bf3403c4dd819700167a3754;p=platform%2Fkernel%2Flinux-starfive.git 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 Signed-off-by: Sumit Saxena Link: https://lore.kernel.org/r/20231003110021.168862-2-chandrakanth.patil@broadcom.com Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index e1aa667..3d4f13d 100644 --- 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_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);