linux-kernel - [PATCH v5 09/13] firmware: arm_sdei: Remove while loop in sdei_event

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Date:   Tue, 22 Sep 2020 23:04:19 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Jonathan.Cameron@...wei.com,
        james.morse@....com, mark.rutland@....com, catalin.marinas@....com,
        will@...nel.org, shan.gavin@...il.com
Subject: [PATCH v5 09/13] firmware: arm_sdei: Remove while loop in sdei_event_unregister()

This removes the unnecessary while loop in sdei_event_unregister()
because of the following two reasons. This shouldn't cause any
functional changes.

   * The while loop is executed for once, meaning it's not needed
     in theory.
   * With the while loop removed, the nested statements can be
     avoid to make the code a bit cleaner.

Signed-off-by: Gavin Shan <gshan@...hat.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/firmware/arm_sdei.c | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c
index 6595bd66aa73..790bff70d169 100644
--- a/drivers/firmware/arm_sdei.c
+++ b/drivers/firmware/arm_sdei.c
@@ -491,24 +491,23 @@ int sdei_event_unregister(u32 event_num)
 
 	mutex_lock(&sdei_events_lock);
 	event = sdei_event_find(event_num);
-	do {
-		if (!event) {
-			pr_warn("Event %u not registered\n", event_num);
-			err = -ENOENT;
-			break;
-		}
+	if (!event) {
+		pr_warn("Event %u not registered\n", event_num);
+		err = -ENOENT;
+		goto unlock;
+	}
 
-		spin_lock(&sdei_list_lock);
-		event->reregister = false;
-		event->reenable = false;
-		spin_unlock(&sdei_list_lock);
+	spin_lock(&sdei_list_lock);
+	event->reregister = false;
+	event->reenable = false;
+	spin_unlock(&sdei_list_lock);
 
-		err = _sdei_event_unregister(event);
-		if (err)
-			break;
+	err = _sdei_event_unregister(event);
+	if (err)
+		goto unlock;
 
-		sdei_event_destroy(event);
-	} while (0);
+	sdei_event_destroy(event);
+unlock:
 	mutex_unlock(&sdei_events_lock);
 
 	return err;
-- 
2.23.0