From: Wang Cong <xiyou.wangcong@gmail.com>
Date: Wed, 21 Jan 2009 15:49:16 +0000 (-0500)
Subject: Btrfs: cleanup fs/btrfs/super.c::btrfs_control_ioctl()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=19d00cc196a3a66fd074f62b39d219f743b92338;p=linux-beck.git

Btrfs: cleanup fs/btrfs/super.c::btrfs_control_ioctl()

- Remove the unused local variable 'len';
- Check return value of kmalloc().

Signed-off-by: Wang Cong <wangcong@zeuux.org>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 92c9b543deff..795b6246bcdf 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -583,17 +583,18 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
 	struct btrfs_ioctl_vol_args *vol;
 	struct btrfs_fs_devices *fs_devices;
 	int ret = -ENOTTY;
-	int len;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
 	vol = kmalloc(sizeof(*vol), GFP_KERNEL);
+	if (!vol)
+		return -ENOMEM;
+
 	if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) {
 		ret = -EFAULT;
 		goto out;
 	}
-	len = strnlen(vol->name, BTRFS_PATH_NAME_MAX);
 
 	switch (cmd) {
 	case BTRFS_IOC_SCAN_DEV: