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nvme/pci: Initialize queue memory before interrupts

PATCH New Keith Busch 3 participants 3 messages Sep 14, 2017 – Sep 15, 2017 NVMe

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Keith Busch

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PATCH 1/1 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 at intel.com>
---
 drivers/nvme/host/pci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
drivers/nvme/host/pci.c +2 -2
index 925467b..df96562 100644
@@ -1310,11 +1310,11 @@ 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:

@@ -1460,6 +1460,7 @@ 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;

@@ -2134,7 +2135,6 @@ 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;
Signature · 1 line
2.5.5
#1 lore raw

PATCH 1/1 nvme/pci: Initialize queue memory before interrupts

Looks good,
Reviewed-by: Johannes Thumshirn <jthumshirn at suse.de>

Signature · 6 lines
Johannes Thumshirn                                          Storage
jthumshirn at suse.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N?rnberg
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HRB 21284 (AG N?rnberg)
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