On Fri 27-10-17 01:35:57, weiping zhang wrote:
> Convert bdi_debug_register to int and then do error handle for it.
>
> Signed-off-by: weiping zhang <zhangweiping@xxxxxxxxxxxxxxx>
This patch looks good to me. You can add:
Reviewed-by: Jan Kara <jack@xxxxxxx>
Honza
> ---
> mm/backing-dev.c | 17 +++++++++++++++--
> 1 file changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index 5072be19d9b2..e9d6a1ede12b 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -116,11 +116,23 @@ static const struct file_operations bdi_debug_stats_fops = {
> .release = single_release,
> };
>
> -static void bdi_debug_register(struct backing_dev_info *bdi, const char *name)
> +static int bdi_debug_register(struct backing_dev_info *bdi, const char *name)
> {
> + if (!bdi_debug_root)
> + return -ENOMEM;
> +
> bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root);
> + if (!bdi->debug_dir)
> + return -ENOMEM;
> +
> bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir,
> bdi, &bdi_debug_stats_fops);
> + if (!bdi->debug_stats) {
> + debugfs_remove(bdi->debug_dir);
> + return -ENOMEM;
> + }
> +
> + return 0;
> }
>
> static void bdi_debug_unregister(struct backing_dev_info *bdi)
> @@ -133,9 +145,10 @@ static inline int bdi_debug_init(void)
> {
> return 0;
> }
> -static inline void bdi_debug_register(struct backing_dev_info *bdi,
> +static inline int bdi_debug_register(struct backing_dev_info *bdi,
> const char *name)
> {
> + return 0;
> }
> static inline void bdi_debug_unregister(struct backing_dev_info *bdi)
> {
> --
> 2.14.2
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
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