[PATCH 2/2] btrfs: convert to mutex guard in btrfs_ioctl_balance_progress()

[Yangtao Li]

To simplify handling, use the guard helper to let the compiler care for
unlocking.

Signed-off-by: Yangtao Li <frank.li@xxxxxxxx>
---
 fs/btrfs/ioctl.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7cec105a4cb0..1d8c28aa84d2 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3620,22 +3620,19 @@ static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
 					 void __user *arg)
 {
 	struct btrfs_ioctl_balance_args *bargs;
-	int ret = 0;
+	int ret;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	mutex_lock(&fs_info->balance_mutex);
-	if (!fs_info->balance_ctl) {
-		ret = -ENOTCONN;
-		goto out;
-	}
+	guard(mutex)(&fs_info->balance_mutex);
+
+	if (!fs_info->balance_ctl)
+		return -ENOTCONN;
 
 	bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
-	if (!bargs) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	if (!bargs)
+		return -ENOMEM;
 
 	btrfs_update_ioctl_balance_args(fs_info, bargs);
 
@@ -3643,8 +3640,7 @@ static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
 		ret = -EFAULT;
 
 	kfree(bargs);
-out:
-	mutex_unlock(&fs_info->balance_mutex);
+
 	return ret;
 }
 
-- 
2.39.0