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| author | Keith Busch <keith.busch@intel.com> | 2015-12-17 17:08:15 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-02-09 12:42:35 -0700 |
| commit | 949928c1c731417cc0f070912c63878b62b544f4 (patch) | |
| tree | 34a5310870609384f3904f5b61c06272c80d55fb /drivers/nvme | |
| parent | 868f2f0b72068a097508b6e8870a8950fd8eb7ef (diff) | |
| download | linux-0-day-949928c1c731417cc0f070912c63878b62b544f4.tar.gz linux-0-day-949928c1c731417cc0f070912c63878b62b544f4.tar.xz | |
NVMe: Fix possible queue use after freed
This notifies blk-mq when the tag set contains a different number of
queues prior to freeing unused ones that the request queue points to.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/pci.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 72ef8322d32ac..08791338ce75c 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1381,7 +1381,7 @@ static int nvme_kthread(void *data) static int nvme_create_io_queues(struct nvme_dev *dev) { - unsigned i; + unsigned i, max; int ret = 0; for (i = dev->queue_count; i <= dev->max_qid; i++) { @@ -1391,7 +1391,8 @@ static int nvme_create_io_queues(struct nvme_dev *dev) } } - for (i = dev->online_queues; i <= dev->queue_count - 1; i++) { + max = min(dev->max_qid, dev->queue_count - 1); + for (i = dev->online_queues; i <= max; i++) { ret = nvme_create_queue(dev->queues[i], i); if (ret) { nvme_free_queues(dev, i); @@ -1548,9 +1549,6 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) adminq->cq_vector = -1; goto free_queues; } - - /* Free previously allocated queues that are no longer usable */ - nvme_free_queues(dev, nr_io_queues + 1); return nvme_create_io_queues(dev); free_queues: @@ -1684,7 +1682,13 @@ static int nvme_dev_add(struct nvme_dev *dev) if (blk_mq_alloc_tag_set(&dev->tagset)) return 0; dev->ctrl.tagset = &dev->tagset; + } else { + blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1); + + /* Free previously allocated queues that are no longer usable */ + nvme_free_queues(dev, dev->online_queues); } + queue_work(nvme_workq, &dev->scan_work); return 0; } |