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nvme-pci: initialize queue memory before interrupts 

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>
This commit is contained in:
Keith Busch 2017-09-14 13:54:39 -04:00 committed by Jens Axboe
parent deb61742e0
commit 161b8be2bd
1 changed files with 2 additions and 2 deletions
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4
drivers/nvme/host/pci.c
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@ -1313,11 +1313,11 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
if (result < 0)
goto release_cq;
nvme_init_queue(nvmeq, qid);
result = queue_request_irq(nvmeq);
if (result < 0)
goto release_sq;
nvme_init_queue(nvmeq, qid);
return result;
release_sq:
@ -1464,6 +1464,7 @@ static int nvme_pci_configure_admin_queue(struct nvme_dev *dev)
return result;
nvmeq->cq_vector = 0;
nvme_init_queue(nvmeq, 0);
result = queue_request_irq(nvmeq);
if (result) {
nvmeq->cq_vector = -1;
@ -2156,7 +2157,6 @@ static void nvme_reset_work(struct work_struct *work)
if (result)
goto out;
nvme_init_queue(dev->queues[0], 0);
result = nvme_alloc_admin_tags(dev);
if (result)
goto out;