[PATCHv2 2/3] block: Remove unnecessary goto labels in debugfs attribute read methods

[Nilay Shroff <nilay@linux.ibm.com>]

In some debugfs attribute read methods, failure to acquire the mutex lock
results in jumping to a label before returning an error code. However this
is unnecessary, as we can return the failure code directly, improving code
readability and reducing complexity.

This commit removes the goto labels and ensures that the method returns
immediately upon failing to acquire the mutex lock.

Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
---
 block/blk-mq-debugfs.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 62775b132d4c..1c958bbaddce 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -402,13 +402,12 @@ static int hctx_tags_show(void *data, struct seq_file *m)
 
 	res = mutex_lock_interruptible(&q->elevator_lock);
 	if (res)
-		goto out;
+		return res;
 	if (hctx->tags)
 		blk_mq_debugfs_tags_show(m, hctx->tags);
 	mutex_unlock(&q->elevator_lock);
 
-out:
-	return res;
+	return 0;
 }
 
 static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
@@ -419,13 +418,12 @@ static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
 
 	res = mutex_lock_interruptible(&q->elevator_lock);
 	if (res)
-		goto out;
+		return res;
 	if (hctx->tags)
 		sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
 	mutex_unlock(&q->elevator_lock);
 
-out:
-	return res;
+	return 0;
 }
 
 static int hctx_sched_tags_show(void *data, struct seq_file *m)
@@ -436,13 +434,12 @@ static int hctx_sched_tags_show(void *data, struct seq_file *m)
 
 	res = mutex_lock_interruptible(&q->elevator_lock);
 	if (res)
-		goto out;
+		return res;
 	if (hctx->sched_tags)
 		blk_mq_debugfs_tags_show(m, hctx->sched_tags);
 	mutex_unlock(&q->elevator_lock);
 
-out:
-	return res;
+	return 0;
 }
 
 static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
@@ -453,13 +450,12 @@ static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
 
 	res = mutex_lock_interruptible(&q->elevator_lock);
 	if (res)
-		goto out;
+		return res;
 	if (hctx->sched_tags)
 		sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
 	mutex_unlock(&q->elevator_lock);
 
-out:
-	return res;
+	return 0;
 }
 
 static int hctx_active_show(void *data, struct seq_file *m)
-- 
2.47.1