On Fri 27-10-17 01:36:14, weiping zhang wrote:
> In order to make error handle more cleaner we call bdi_debug_register
> before set state to WB_registered, that we can avoid call bdi_unregister
> in release_bdi().
>
> Signed-off-by: weiping zhang <zhangweiping@xxxxxxxxxxxxxxx>
> ---
> mm/backing-dev.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index e9d6a1ede12b..54396d53f471 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -893,10 +893,13 @@ int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, va_list args)
> if (IS_ERR(dev))
> return PTR_ERR(dev);
>
> + if (bdi_debug_register(bdi, dev_name(dev))) {
> + device_destroy(bdi_class, dev->devt);
> + return -ENOMEM;
> + }
> cgwb_bdi_register(bdi);
> bdi->dev = dev;
>
> - bdi_debug_register(bdi, dev_name(dev));
> set_bit(WB_registered, &bdi->wb.state);
>
> spin_lock_bh(&bdi_lock);
> @@ -916,6 +919,8 @@ int bdi_register(struct backing_dev_info *bdi, const char *fmt, ...)
> va_start(args, fmt);
> ret = bdi_register_va(bdi, fmt, args);
> va_end(args);
> + if (ret)
> + bdi_put(bdi);
Why do you drop bdi reference here in case of error? We didn't do it
previously if bdi_register_va() failed for other reasons...
Honza
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
