From: Narsimhulu Musini <nmusini@cisco.com>
Date: Thu, 17 Mar 2016 07:51:15 +0000 (-0700)
Subject: snic: Fixing race in the hba reset and IO/TM completion
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0da8519b2b1f08113cda65af88a4c9e35157dd53;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

snic: Fixing race in the hba reset and IO/TM completion

While HBA reset is in progress, if IO/TM completion is received for the
same IO then IO/TM completion path releases the driver private resources
associated with IO. This fix prevents releasing the resources in
IO and TM completion path if HBA reset is in progress.

Signed-off-by: Narsimhulu Musini <nmusini@cisco.com>
Signed-off-by: Sesidhar Baddela <sebaddel@cisco.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---

diff --git a/drivers/scsi/snic/snic.h b/drivers/scsi/snic/snic.h
index d7f5ba6ba84c..8ed778d4dbb9 100644
--- a/drivers/scsi/snic/snic.h
+++ b/drivers/scsi/snic/snic.h
@@ -95,6 +95,8 @@
 #define SNIC_DEV_RST_NOTSUP		BIT(25)
 #define SNIC_SCSI_CLEANUP		BIT(26)
 #define SNIC_HOST_RESET_ISSUED		BIT(27)
+#define SNIC_HOST_RESET_CMD_TERM	\
+	(SNIC_DEV_RST_NOTSUP | SNIC_SCSI_CLEANUP | SNIC_HOST_RESET_ISSUED)
 
 #define SNIC_ABTS_TIMEOUT		30000		/* msec */
 #define SNIC_LUN_RESET_TIMEOUT		30000		/* msec */
@@ -216,9 +218,10 @@ enum snic_msix_intr_index {
 	SNIC_MSIX_INTR_MAX,
 };
 
+#define SNIC_INTRHDLR_NAMSZ	(2 * IFNAMSIZ)
 struct snic_msix_entry {
 	int requested;
-	char devname[IFNAMSIZ];
+	char devname[SNIC_INTRHDLR_NAMSZ];
 	irqreturn_t (*isr)(int, void *);
 	void *devid;
 };
diff --git a/drivers/scsi/snic/snic_scsi.c b/drivers/scsi/snic/snic_scsi.c
index 5a709ebdb282..abada16b375b 100644
--- a/drivers/scsi/snic/snic_scsi.c
+++ b/drivers/scsi/snic/snic_scsi.c
@@ -601,6 +601,12 @@ snic_icmnd_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
 		      sc->device->lun, sc, sc->cmnd[0], snic_cmd_tag(sc),
 		      CMD_FLAGS(sc), rqi);
 
+	if (CMD_FLAGS(sc) & SNIC_HOST_RESET_CMD_TERM) {
+		spin_unlock_irqrestore(io_lock, flags);
+
+		return;
+	}
+
 	SNIC_BUG_ON(rqi != (struct snic_req_info *)ctx);
 	WARN_ON_ONCE(req);
 	if (!rqi) {
@@ -782,6 +788,11 @@ snic_process_itmf_cmpl(struct snic *snic,
 
 	io_lock = snic_io_lock_hash(snic, sc);
 	spin_lock_irqsave(io_lock, flags);
+	if (CMD_FLAGS(sc) & SNIC_HOST_RESET_CMD_TERM) {
+		spin_unlock_irqrestore(io_lock, flags);
+
+		return ret;
+	}
 	rqi = (struct snic_req_info *) CMD_SP(sc);
 	WARN_ON_ONCE(!rqi);