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raid5: handle register_shrinker failure

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register_shrinker() now can fail. When it happens, shrinker.nr_deferred is
null. We use it to determine if unregister_shrinker is required.

Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Shaohua Li 2016-09-21 09:07:13 -07:00
parent 6a0f53ff35
commit 30c8946566
1 changed files with 1 additions and 1 deletions
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2
drivers/md/raid5.c
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@ -6372,7 +6372,7 @@ static void free_conf(struct r5conf *conf)
{
if (conf->log)
r5l_exit_log(conf->log);
if (conf->shrinker.seeks)
if (conf->shrinker.nr_deferred)
unregister_shrinker(&conf->shrinker);
free_thread_groups(conf);