[PATCH V2] nvme-pci: set cq_vector to -1 if io queue setup fails

[Jianchao Wang]

nvme cq irq is freed based on queue_count. When the sq/cq creation
fails, irq will not be setup. free_irq will warn 'Try to free
already-free irq'.

To fix it, set the nvmeq->cq_vector to -1, then nvme_suspend_queue
will ignore it.

Change log:
V1 -> V2
 - Follow Keith's suggestion, just set cq_vector to -1 if io queue setup
   fails.
 - Change patch name and comment

Signed-off-by: Jianchao Wang <jianchao.w.w...@oracle.com>
---
 drivers/nvme/host/pci.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 4a7c420..f4528ef 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1452,7 +1452,7 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, 
int qid)
        nvmeq->cq_vector = qid - 1;
        result = adapter_alloc_cq(dev, qid, nvmeq);
        if (result < 0)
-               return result;
+               goto clean_cq_vector;
 
        result = adapter_alloc_sq(dev, qid, nvmeq);
        if (result < 0)
@@ -1461,14 +1461,17 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, 
int qid)
        nvme_init_queue(nvmeq, qid);
        result = queue_request_irq(nvmeq);
        if (result < 0)
-               goto release_sq;
+               goto offline;
 
        return result;
 
- release_sq:
+offline:
+       dev->online_queues--;
        adapter_delete_sq(dev, qid);
- release_cq:
+release_cq:
        adapter_delete_cq(dev, qid);
+clean_cq_vector:
+       nvmeq->cq_vector = -1;
        return result;
 }
 
-- 
2.7.4