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@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
> 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
>
