linux-kernel - Re: [PATCH] bcache: remove unnecessary null poiner check in cache_set

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Message-ID: <CA+NNRhEo-qryWzGoVbUtQVSbOhbTTwVuzAA7DYmTOcVN8oYehQ@mail.gmail.com>
Date:   Tue, 11 Sep 2018 08:59:52 +0800
From:   Junhui Tang <tang.junhui.linux@...il.com>
To:     zhongjiang@...wei.com
Cc:     colyli@...e.de, Kent Overstreet <kent.overstreet@...il.com>,
        linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bcache: remove unnecessary null poiner check in cache_set_free

This patch is NOT OK to me，maybe many cache in a  cache_set, and some
cache are not registered yet, so ca is possible NULL.
zhong jiang <zhongjiang@...wei.com> 于2018年9月8日周六 下午7:52写道：
>
> The iterator in for_each_cache is never null, therefore, remove
> the redundant null pointer check.
>
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  drivers/md/bcache/super.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
> index 94c756c..2d26f9e 100644
> --- a/drivers/md/bcache/super.c
> +++ b/drivers/md/bcache/super.c
> @@ -1513,12 +1513,11 @@ static void cache_set_free(struct closure *cl)
>         bch_btree_cache_free(c);
>         bch_journal_free(c);
>
> -       for_each_cache(ca, c, i)
> -               if (ca) {
> -                       ca->set = NULL;
> -                       c->cache[ca->sb.nr_this_dev] = NULL;
> -                       kobject_put(&ca->kobj);
> -               }
> +       for_each_cache(ca, c, i) {
> +               ca->set = NULL;
> +               c->cache[ca->sb.nr_this_dev] = NULL;
> +               kobject_put(&ca->kobj);
> +       }
>
>         bch_bset_sort_state_free(&c->sort);
>         free_pages((unsigned long) c->uuids, ilog2(bucket_pages(c)));
> --
> 1.7.12.4
>