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nvme-pci: Skip queue deletion if there are no queues

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User reported controller always retains CSTS.RDY to 1, which fails
controller disabling when resetting the controller. This is also before
the admin queue is allocated, and trying to disable an unallocated queue
results in a NULL dereference.

Reported-by: Alex Gagniuc <[email protected]>
Signed-off-by: Keith Busch <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Keith Busch 2018-04-12 09:16:08 -06:00 • committed by Jens Axboe
commit 64ee0ac052
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/host/pci.c
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@ -2201,7 +2201,7 @@ static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown)
nvme_stop_queues(&dev->ctrl);
if (!dead) {
if (!dead && dev->ctrl.queue_count > 0) {
/*
* If the controller is still alive tell it to stop using the
* host memory buffer. In theory the shutdown / reset should