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| author | Ming Lei <tom.leiming@gmail.com> | 2015-06-04 16:25:04 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-06-09 23:32:38 +0200 |
| commit | c3b4afca7023b5aa0531912364246e67f79b3010 (patch) | |
| tree | 2bf7586a979548fb0fc950e5b84b646f96360ea6 /block | |
| parent | Linux 4.1-rc7 (diff) | |
| download | linux-c3b4afca7023b5aa0531912364246e67f79b3010.tar.xz linux-c3b4afca7023b5aa0531912364246e67f79b3010.zip | |
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], 6cd18e711dd8075 (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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index e68b71b85a7e..594eea04266e 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1600,6 +1600,7 @@ static int blk_mq_hctx_notify(void *data, unsigned long action, return NOTIFY_OK; } +/* hctx->ctxs will be freed in queue's release handler */ static void blk_mq_exit_hctx(struct request_queue *q, struct blk_mq_tag_set *set, struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) @@ -1618,7 +1619,6 @@ static void blk_mq_exit_hctx(struct request_queue *q, blk_mq_unregister_cpu_notifier(&hctx->cpu_notifier); blk_free_flush_queue(hctx->fq); - kfree(hctx->ctxs); blk_mq_free_bitmap(&hctx->ctx_map); } @@ -1891,8 +1891,12 @@ void blk_mq_release(struct request_queue *q) unsigned int i; /* hctx kobj stays in hctx */ - queue_for_each_hw_ctx(q, hctx, i) + queue_for_each_hw_ctx(q, hctx, i) { + if (!hctx) + continue; + kfree(hctx->ctxs); kfree(hctx); + } kfree(q->queue_hw_ctx); |