4.4-stable review patch. If anyone has any objections, please let me know.
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From: Keith Busch keith.busch@intel.com
commit 161b8be2bd6abad250d4b3f674bdd5480f15beeb upstream.
A spurious interrupt before the nvme driver has initialized the completion queue may inadvertently cause the driver to believe it has a completion to process. This may result in a NULL dereference since the nvmeq's tags are not set at this point.
The patch initializes the host's CQ memory so that a spurious interrupt isn't mistaken for a real completion.
Signed-off-by: Keith Busch keith.busch@intel.com Reviewed-by: Johannes Thumshirn jthumshirn@suse.de Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Jens Axboe axboe@kernel.dk [bwh: Backported to 4.4: adjust context] Cc: Ben Hutchings ben.hutchings@codethink.co.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/nvme/host/pci.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1589,11 +1589,11 @@ static int nvme_create_queue(struct nvme if (result < 0) goto release_cq;
+ nvme_init_queue(nvmeq, qid); result = queue_request_irq(dev, nvmeq, nvmeq->irqname); if (result < 0) goto release_sq;
- nvme_init_queue(nvmeq, qid); return result;
release_sq: @@ -1797,6 +1797,7 @@ static int nvme_configure_admin_queue(st goto free_nvmeq;
nvmeq->cq_vector = 0; + nvme_init_queue(nvmeq, 0); result = queue_request_irq(dev, nvmeq, nvmeq->irqname); if (result) { nvmeq->cq_vector = -1; @@ -3165,7 +3166,6 @@ static void nvme_probe_work(struct work_ goto disable; }
- nvme_init_queue(dev->queues[0], 0); result = nvme_alloc_admin_tags(dev); if (result) goto disable;