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>
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@ -305,6 +305,7 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
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*/
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void mddev_suspend(struct mddev *mddev)
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{
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WARN_ON_ONCE(current == mddev->thread->tsk);
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if (mddev->suspended++)
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return;
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synchronize_rcu();
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