blk-mq: free hctx->ctxs in queue's release handler
Now blk_cleanup_queue() can be called before calling del_gendisk()[1], inside which hctx->ctxs is touched from blk_mq_unregister_hctx(), but the variable has been freed by blk_cleanup_queue() at that time. So this patch moves freeing of hctx->ctxs into queue's release handler for fixing the oops reported by Stefan. [1], 6cd18e71 (block: destroy bdi before blockdev is unregistered) Reported-by: Stefan Seyfried <stefan.seyfried@googlemail.com> Cc: NeilBrown <neilb@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org (v4.0) Signed-off-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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