[PATCH v2] nvme: add quirk to force medium priority for SQ creation

[Keith Busch]

On Tue, May 08, 2018 at 09:54:20AM -0600, Jens Axboe wrote:
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -1097,6 +1097,14 @@ static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
>  	int flags = NVME_QUEUE_PHYS_CONTIG;
>  
>  	/*
> +	 * Some drives have a bug that auto-enables WRRU if MEDIUM isn't
> +	 * set. Since URGENT priority is zeroes, it makes all queues
> +	 * URGENT.
> +	 */
> +	if (ctrl->quirks & NVME_QUIRK_MEDIUM_PRIO_SQ)
> +		flags |= NVME_SQ_PRIO_MEDIUM;

'ctrl' is undeclared in this function; must be 'dev->ctrl.quirks'.