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>

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index e3f4978..43cbc74 100644 (file)
--- 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 6860fd2..8b6cc1b 100644 (file)
--- 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 @@ 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;
 }

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h
index 8358b68..d57ecc7 100644 (file)
--- 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