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| author | Matias Bjorling <m@bjorling.me> | 2013-12-10 16:50:38 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-12-15 12:17:16 -0800 |
| commit | 57053d8c5c59562cac156513740c10b502a40968 (patch) | |
| tree | 0e71310912a1004760561540bc7e665957468ee5 | |
| parent | e4158f1b1090d362a7c998bd654cc3fe8f5c863c (diff) | |
| download | lwn-57053d8c5c59562cac156513740c10b502a40968.tar.gz lwn-57053d8c5c59562cac156513740c10b502a40968.zip | |
null_blk: mem garbage on NUMA systems during init
For NUMA systems, initializing the blk-mq layer and using per node hctx.
We initialize submit queues to 1, while blk-mq nr_hw_queues is
initialized to the number of NUMA nodes.
This makes the null_init_hctx function overwrite memory outside of what
it allocated. In my case it lead to writing garbage into struct
request_queue's mq_map.
Signed-off-by: Matias Bjorling <m@bjorling.me>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/block/null_blk.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index ea192ec029c4..f370fc13aea5 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -495,23 +495,23 @@ static int null_add_dev(void) spin_lock_init(&nullb->lock); + if (queue_mode == NULL_Q_MQ && use_per_node_hctx) + submit_queues = nr_online_nodes; + if (setup_queues(nullb)) goto err; if (queue_mode == NULL_Q_MQ) { null_mq_reg.numa_node = home_node; null_mq_reg.queue_depth = hw_queue_depth; + null_mq_reg.nr_hw_queues = submit_queues; if (use_per_node_hctx) { null_mq_reg.ops->alloc_hctx = null_alloc_hctx; null_mq_reg.ops->free_hctx = null_free_hctx; - - null_mq_reg.nr_hw_queues = nr_online_nodes; } else { null_mq_reg.ops->alloc_hctx = blk_mq_alloc_single_hw_queue; null_mq_reg.ops->free_hctx = blk_mq_free_single_hw_queue; - - null_mq_reg.nr_hw_queues = submit_queues; } nullb->q = blk_mq_init_queue(&null_mq_reg, nullb); |