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md: remove duplicated test on ->openers when calling do_md_stop()

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do_md_stop tests mddev->openers while holding ->open_mutex,
and fails if this count is too high.
So callers do not need to check mddev->openers and doing so isn't
very meaningful as they don't hold ->open_mutex so the number could
change.

So remove the unnecessary tests on mddev->openers.
These are not called often enough for there to be any gain in
an early test on ->open_mutex to avoid the need for a slightly more
costly mutex_lock call.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-07-31 10:04:55 +10:00
parent 3f9e7c140e
commit 90cf195d9b
1 changed files with 2 additions and 6 deletions
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8
drivers/md/md.c
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@ -3942,17 +3942,13 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
break;
case clear:
/* stopping an active array */
if (atomic_read(&mddev->openers) > 0)
return -EBUSY;
err = do_md_stop(mddev, 0, NULL);
break;
case inactive:
/* stopping an active array */
if (mddev->pers) {
if (atomic_read(&mddev->openers) > 0)
return -EBUSY;
if (mddev->pers)
err = do_md_stop(mddev, 2, NULL);
} else
else
err = 0; /* already inactive */
break;
case suspended: