From: Kees Cook <keescook@chromium.org>
Date: Sun, 22 Oct 2017 15:30:04 -0700
Subject: [PATCH] scsi: megaraid: Convert timers to use timer_setup()
Git-commit: c251a7be46b0ee64d02b321081e24ea51fae2cfe
Patch-mainline: v4.15-rc1
References: FATE#325920

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly. Also consolidates the timer setup
functions arguments, which are all identical, and corrects on-stack timer
usage.

Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Sumit Saxena <sumit.saxena@broadcom.com>
Cc: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: megaraidlinux.pdl@broadcom.com
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 drivers/scsi/megaraid/megaraid_sas_base.c   | 35 +++++++++++------------------
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 15 +++----------
 5 files changed, 47 insertions(+), 62 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index e518dadc8161..a36e18156e49 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -2114,22 +2114,19 @@ static void megasas_complete_cmd_dpc(unsigned long instance_addr)
 	megasas_check_and_restore_queue_depth(instance);
 }
 
+static void megasas_sriov_heartbeat_handler(struct timer_list *t);
+
 /**
- * megasas_start_timer - Initializes a timer object
+ * megasas_start_timer - Initializes sriov heartbeat timer object
  * @instance:		Adapter soft state
- * @timer:		timer object to be initialized
- * @fn:			timer function
- * @interval:		time interval between timer function call
  *
  */
-void megasas_start_timer(struct megasas_instance *instance,
-			struct timer_list *timer,
-			void *fn, unsigned long interval)
-{
-	init_timer(timer);
-	timer->expires = jiffies + interval;
-	timer->data = (unsigned long)instance;
-	timer->function = fn;
+void megasas_start_timer(struct megasas_instance *instance)
+{
+	struct timer_list *timer = &instance->sriov_heartbeat_timer;
+
+	timer_setup(timer, megasas_sriov_heartbeat_handler, 0);
+	timer->expires = jiffies + MEGASAS_SRIOV_HEARTBEAT_INTERVAL_VF;
 	add_timer(timer);
 }
 
@@ -2515,10 +2512,10 @@ int megasas_sriov_start_heartbeat(struct megasas_instance *instance,
 }
 
 /* Handler for SR-IOV heartbeat */
-void megasas_sriov_heartbeat_handler(unsigned long instance_addr)
+static void megasas_sriov_heartbeat_handler(struct timer_list *t)
 {
 	struct megasas_instance *instance =
-		(struct megasas_instance *)instance_addr;
+		from_timer(instance, t, sriov_heartbeat_timer);
 
 	if (instance->hb_host_mem->HB.fwCounter !=
 	    instance->hb_host_mem->HB.driverCounter) {
@@ -5493,10 +5490,7 @@ static int megasas_init_fw(struct megasas_instance *instance)
 	/* Launch SR-IOV heartbeat timer */
 	if (instance->requestorId) {
 		if (!megasas_sriov_start_heartbeat(instance, 1))
-			megasas_start_timer(instance,
-					    &instance->sriov_heartbeat_timer,
-					    megasas_sriov_heartbeat_handler,
-					    MEGASAS_SRIOV_HEARTBEAT_INTERVAL_VF);
+			megasas_start_timer(instance);
 		else
 			instance->skip_heartbeat_timer_del = 1;
 	}
@@ -6507,10 +6501,7 @@ megasas_resume(struct pci_dev *pdev)
 	/* Re-launch SR-IOV heartbeat timer */
 	if (instance->requestorId) {
 		if (!megasas_sriov_start_heartbeat(instance, 0))
-			megasas_start_timer(instance,
-					    &instance->sriov_heartbeat_timer,
-					    megasas_sriov_heartbeat_handler,
-					    MEGASAS_SRIOV_HEARTBEAT_INTERVAL_VF);
+			megasas_start_timer(instance);
 		else {
 			instance->skip_heartbeat_timer_del = 1;
 			goto fail_init_mfi;
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 11bd2e698b84..3c399e7b3fe1 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -85,12 +85,9 @@ int megasas_transition_to_ready(struct megasas_instance *instance, int ocr);
 void megaraid_sas_kill_hba(struct megasas_instance *instance);
 
 extern u32 megasas_dbg_lvl;
-void megasas_sriov_heartbeat_handler(unsigned long instance_addr);
 int megasas_sriov_start_heartbeat(struct megasas_instance *instance,
 				  int initial);
-void megasas_start_timer(struct megasas_instance *instance,
-			struct timer_list *timer,
-			 void *fn, unsigned long interval);
+void megasas_start_timer(struct megasas_instance *instance);
 extern struct megasas_mgmt_info megasas_mgmt_info;
 extern unsigned int resetwaittime;
 extern unsigned int dual_qdepth_disable;
@@ -4369,10 +4366,7 @@ int megasas_reset_fusion(struct Scsi_Host *shost, int reason)
 			/* Restart SR-IOV heartbeat */
 			if (instance->requestorId) {
 				if (!megasas_sriov_start_heartbeat(instance, 0))
-					megasas_start_timer(instance,
-							    &instance->sriov_heartbeat_timer,
-							    megasas_sriov_heartbeat_handler,
-							    MEGASAS_SRIOV_HEARTBEAT_INTERVAL_VF);
+					megasas_start_timer(instance);
 				else
 					instance->skip_heartbeat_timer_del = 1;
 			}
@@ -4404,10 +4398,7 @@ int megasas_reset_fusion(struct Scsi_Host *shost, int reason)
 	} else {
 		/* For VF: Restart HB timer if we didn't OCR */
 		if (instance->requestorId) {
-			megasas_start_timer(instance,
-					    &instance->sriov_heartbeat_timer,
-					    megasas_sriov_heartbeat_handler,
-					    MEGASAS_SRIOV_HEARTBEAT_INTERVAL_VF);
+			megasas_start_timer(instance);
 		}
 		clear_bit(MEGASAS_FUSION_IN_RESET, &instance->reset_flags);
 		instance->instancet->enable_intr(instance);
-- 
2.16.4