[PATCH 4/7] btrfs: Allocate btrfs_ioctl_balance_args on stack

[Goldwyn Rodrigues <rgoldwyn@suse.de>]

From: Goldwyn Rodrigues <rgoldwyn@suse.com>

Instead of using kmalloc() to allocate btrfs_ioctl_balance_args, allocate
btrfs_ioctl_balance_args on stack.

sizeof(btrfs_ioctl_balance_args) = 1024

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 fs/btrfs/ioctl.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 90b134b5a653..9c3acc539052 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4141,7 +4141,7 @@ static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
 					 void __user *arg)
 {
-	struct btrfs_ioctl_balance_args *bargs;
+	struct btrfs_ioctl_balance_args bargs = {0};
 	int ret = 0;
 
 	if (!capable(CAP_SYS_ADMIN))
@@ -4153,18 +4153,11 @@ static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
 		goto out;
 	}
 
-	bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
-	if (!bargs) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	btrfs_update_ioctl_balance_args(fs_info, bargs);
+	btrfs_update_ioctl_balance_args(fs_info, &bargs);
 
-	if (copy_to_user(arg, bargs, sizeof(*bargs)))
+	if (copy_to_user(arg, &bargs, sizeof(bargs)))
 		ret = -EFAULT;
 
-	kfree(bargs);
 out:
 	mutex_unlock(&fs_info->balance_mutex);
 	return ret;
-- 
2.32.0