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scsi: megaraid_sas: Do not initiate OCR if controller is not in ready state 

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>
This commit is contained in:
Anand Lodnoor 2020-01-14 16:51:19 +05:30 committed by Martin K. Petersen
parent 201a810cc1
commit 6d7537270e
3 changed files with 5 additions and 2 deletions
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3
drivers/scsi/megaraid/megaraid_sas_base.c
View File

@ -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;

3
drivers/scsi/megaraid/megaraid_sas_fusion.c
View File

@ -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 @@ kill_hba:
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;
}

1
drivers/scsi/megaraid/megaraid_sas_fusion.h
View File

@ -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