tree 4ab92bc060a79faa8363f29462cea00cbbddcf36
parent 399146b80ed6fb9f1ebe5a07234f00dff446d2b4
author Shaohua Li <shli@fb.com> 1456364461 -0800
committer Shaohua Li <shli@fb.com> 1456508697 -0800

MD: warn for potential deadlock

The personality thread shouldn't call mddev_suspend(). Because
mddev_suspend() will for all IO finish, but IO is handled in personality
thread, so this could cause deadlock. To trigger this early, add a
warning if mddev_suspend() is called from personality thread.

Suggested-by: NeilBrown <neilb@suse.com>
Cc: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>