4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Keith Busch <keith.busch@xxxxxxxxx>
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@xxxxxxxxx>
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
[bwh: Backported to 4.4: adjust context]
Cc: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
