On Thu, Feb 12, 2015 at 09:44:33AM +0800, Qu Wenruo wrote:
> --- a/fs/btrfs/sysfs.c
> +++ b/fs/btrfs/sysfs.c
> @@ -118,13 +118,19 @@ static ssize_t btrfs_feature_attr_store(struct kobject
> *kobj,
> int ret;
>
> fs_info = to_fs_info(kobj);
> - if (!fs_info)
> - return -EPERM;
> + if (!fs_info) {
> + ret = -EPERM;
> + goto out;
This would do a call to sb_drop_write() without a pairing
sb_want_write(), immediate 'return' was correct.
[...]
> + }
>
> - ret = kstrtoul(skip_spaces(buf), 0, &val);
> + ret = sb_want_write(fs_info->sb);
> if (ret)
> return ret;
[...]
>
> +out:
> + sb_drop_write(fs_info->sb);
> + if (!ret)
> + return count;
> + return ret;
--
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