From: Anand Lodnoor <anand.lodnoor@broadcom.com>
Date: Tue, 14 Jan 2020 16:51:19 +0530
Subject: [PATCH] scsi: megaraid_sas: Do not initiate OCR if controller is not
in ready state
Git-commit: 6d7537270e3283b92f9b327da9d58a4de40fe8d0
Patch-mainline: v5.6-rc1
References: jsc#SLE-10720
Driver initiates OCR if a DCMD command times out. But there is a deadlock
if the driver attempts to invoke another OCR before the mutex lock
(reset_mutex) is released from the previous session of OCR.
This patch takes care of the above scenario using new flag
MEGASAS_FUSION_OCR_NOT_POSSIBLE to indicate if OCR is possible.
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/1579000882-20246-9-git-send-email-anand.lodnoor@broadcom.com
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Anand Lodnoor <anand.lodnoor@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/scsi/megaraid/megaraid_sas_base.c | 3 ++-
drivers/scsi/megaraid/megaraid_sas_fusion.c | 3 ++-
drivers/scsi/megaraid/megaraid_sas_fusion.h | 1 +
3 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index e3f4978d1ebd..43cbc749f66c 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -4403,7 +4403,8 @@ dcmd_timeout_ocr_possible(struct megasas_instance *instance) {
if (instance->adapter_type == MFI_SERIES)
return KILL_ADAPTER;
else if (instance->unload ||
- test_bit(MEGASAS_FUSION_IN_RESET, &instance->reset_flags))
+ test_bit(MEGASAS_FUSION_OCR_NOT_POSSIBLE,
+ &instance->reset_flags))
return IGNORE_TIMEOUT;
else
return INITIATE_OCR;
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 6860fd288d0f..8b6cc1ba4209 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -4851,6 +4851,7 @@ int megasas_reset_fusion(struct Scsi_Host *shost, int reason)
if (instance->requestorId && !instance->skip_heartbeat_timer_del)
del_timer_sync(&instance->sriov_heartbeat_timer);
set_bit(MEGASAS_FUSION_IN_RESET, &instance->reset_flags);
+ set_bit(MEGASAS_FUSION_OCR_NOT_POSSIBLE, &instance->reset_flags);
atomic_set(&instance->adprecovery, MEGASAS_ADPRESET_SM_POLLING);
instance->instancet->disable_intr(instance);
megasas_sync_irqs((unsigned long)instance);
@@ -5059,7 +5060,7 @@ int megasas_reset_fusion(struct Scsi_Host *shost, int reason)
instance->skip_heartbeat_timer_del = 1;
retval = FAILED;
out:
- clear_bit(MEGASAS_FUSION_IN_RESET, &instance->reset_flags);
+ clear_bit(MEGASAS_FUSION_OCR_NOT_POSSIBLE, &instance->reset_flags);
mutex_unlock(&instance->reset_mutex);
return retval;
}
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h
index 8358b68d6259..d57ecc7f88d8 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.h
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h
@@ -89,6 +89,7 @@ enum MR_RAID_FLAGS_IO_SUB_TYPE {
#define MEGASAS_FP_CMD_LEN 16
#define MEGASAS_FUSION_IN_RESET 0
+#define MEGASAS_FUSION_OCR_NOT_POSSIBLE 1
#define RAID_1_PEER_CMDS 2
#define JBOD_MAPS_COUNT 2
#define MEGASAS_REDUCE_QD_COUNT 64
--
2.16.4