Commit 978a7a47 authored by NeilBrown's avatar NeilBrown

md/bitmap: protect clearing of ->bitmap by mddev->lock

This makes it safe to inspect the struct while holding only
the spinlock.
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 36d091f4
......@@ -1619,7 +1619,9 @@ void bitmap_destroy(struct mddev *mddev)
return;
mutex_lock(&mddev->bitmap_info.mutex);
spin_lock(&mddev->lock);
mddev->bitmap = NULL; /* disconnect from the md device */
spin_unlock(&mddev->lock);
mutex_unlock(&mddev->bitmap_info.mutex);
if (mddev->thread)
mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
......
......@@ -392,6 +392,7 @@ struct mddev {
* clearing MD_CHANGE_*
* in_sync - and related safemode and MD_CHANGE changes
* pers (also protected by reconfig_mutex and pending IO).
* clearing ->bitmap
*/
spinlock_t lock;
wait_queue_head_t sb_wait; /* for waiting on superblock updates */
......
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