linux-kernel - [PATCH v2 2/2] scsi: libsas: Use bool for queue

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Date:   Fri, 25 Feb 2022 18:57:36 +0800
From:   John Garry <john.garry@...wei.com>
To:     <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>
CC:     <chenxiang66@...ilicon.com>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <damien.lemoal@...nsource.wdc.com>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH v2 2/2] scsi: libsas: Use bool for queue_work() return code

Function queue_work() returns a bool, so use a bool to hold this value
for the return code from callers, which should make the code a tiny bit
more clear.

Also take this opportunity to condense the code of the those callers, such
as sas_queue_work(), as suggested by Damien.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/scsi/libsas/sas_event.c    | 30 +++++++++++-------------------
 drivers/scsi/libsas/sas_internal.h |  2 +-
 2 files changed, 12 insertions(+), 20 deletions(-)

diff --git a/drivers/scsi/libsas/sas_event.c b/drivers/scsi/libsas/sas_event.c
index 8ff58fd97837..f3a17191a4fe 100644
--- a/drivers/scsi/libsas/sas_event.c
+++ b/drivers/scsi/libsas/sas_event.c
@@ -10,29 +10,26 @@
 #include <scsi/scsi_host.h>
 #include "sas_internal.h"
 
-int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
+bool sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
 {
-	/* it's added to the defer_q when draining so return succeed */
-	int rc = 1;
-
 	if (!test_bit(SAS_HA_REGISTERED, &ha->state))
-		return 0;
+		return false;
 
 	if (test_bit(SAS_HA_DRAINING, &ha->state)) {
 		/* add it to the defer list, if not already pending */
 		if (list_empty(&sw->drain_node))
 			list_add_tail(&sw->drain_node, &ha->defer_q);
-	} else
-		rc = queue_work(ha->event_q, &sw->work);
+		return true;
+	}
 
-	return rc;
+	return queue_work(ha->event_q, &sw->work);
 }
 
-static int sas_queue_event(int event, struct sas_work *work,
+static bool sas_queue_event(int event, struct sas_work *work,
 			    struct sas_ha_struct *ha)
 {
 	unsigned long flags;
-	int rc;
+	bool rc;
 
 	spin_lock_irqsave(&ha->lock, flags);
 	rc = sas_queue_work(ha, work);
@@ -44,13 +41,12 @@ static int sas_queue_event(int event, struct sas_work *work,
 void sas_queue_deferred_work(struct sas_ha_struct *ha)
 {
 	struct sas_work *sw, *_sw;
-	int ret;
 
 	spin_lock_irq(&ha->lock);
 	list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
 		list_del_init(&sw->drain_node);
-		ret = sas_queue_work(ha, sw);
-		if (ret != 1) {
+
+		if (!sas_queue_work(ha, sw)) {
 			pm_runtime_put(ha->dev);
 			sas_free_event(to_asd_sas_event(&sw->work));
 		}
@@ -170,7 +166,6 @@ void sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event,
 {
 	struct sas_ha_struct *ha = phy->ha;
 	struct asd_sas_event *ev;
-	int ret;
 
 	BUG_ON(event >= PORT_NUM_EVENTS);
 
@@ -186,8 +181,7 @@ void sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event,
 	if (sas_defer_event(phy, ev))
 		return;
 
-	ret = sas_queue_event(event, &ev->work, ha);
-	if (ret != 1) {
+	if (!sas_queue_event(event, &ev->work, ha)) {
 		pm_runtime_put(ha->dev);
 		sas_free_event(ev);
 	}
@@ -199,7 +193,6 @@ void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event,
 {
 	struct sas_ha_struct *ha = phy->ha;
 	struct asd_sas_event *ev;
-	int ret;
 
 	BUG_ON(event >= PHY_NUM_EVENTS);
 
@@ -215,8 +208,7 @@ void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event,
 	if (sas_defer_event(phy, ev))
 		return;
 
-	ret = sas_queue_event(event, &ev->work, ha);
-	if (ret != 1) {
+	if (!sas_queue_event(event, &ev->work, ha)) {
 		pm_runtime_put(ha->dev);
 		sas_free_event(ev);
 	}
diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
index 24843db2cb65..13d0ffaada93 100644
--- a/drivers/scsi/libsas/sas_internal.h
+++ b/drivers/scsi/libsas/sas_internal.h
@@ -67,7 +67,7 @@ void sas_porte_broadcast_rcvd(struct work_struct *work);
 void sas_porte_link_reset_err(struct work_struct *work);
 void sas_porte_timer_event(struct work_struct *work);
 void sas_porte_hard_reset(struct work_struct *work);
-int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw);
+bool sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw);
 
 int sas_notify_lldd_dev_found(struct domain_device *);
 void sas_notify_lldd_dev_gone(struct domain_device *);
-- 
2.26.2