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* [PATCH v2 08/11] megaraid_sas: Do not initiate OCR if controller is not in ready state
       [not found] <1579000882-20246-1-git-send-email-anand.lodnoor@broadcom.com>
@ 2020-01-14 11:21 ` Anand Lodnoor
  0 siblings, 0 replies; only message in thread
From: Anand Lodnoor @ 2020-01-14 11:21 UTC (permalink / raw)
  To: linux-scsi
  Cc: kashyap.desai, sumit.saxena, kiran-kumar.kasturi, sankar.patra,
	sasikumar.pc, shivasharan.srikanteshwara, chandrakanth.patil,
	Anand Lodnoor, stable

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
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Anand Lodnoor <anand.lodnoor@broadcom.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 8bee5629..792db75 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -4403,7 +4403,8 @@ int megasas_alloc_cmds(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
--- 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 8358b68..d57ecc7 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
-- 
1.8.3.1


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2020-01-14 11:21 ` [PATCH v2 08/11] megaraid_sas: Do not initiate OCR if controller is not in ready state Anand Lodnoor

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