Re: [PATCH] scsi: fix regression that accidentally disabled block-based tcq

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 09/13/2014 01:00 AM, Christoph Hellwig wrote:
> Please try the fix below, looks like the commit broke TCQ for all drivers 
> using block-level tagging.

Yes this one does the trick and fixes things. Note the git tree I used for
testing also had your previous fix to split up the blk_tcq union in 2
separate struct members. Let me know if you want me to re-test without that
fix.

Thanks & Regards,

Hans


> 
> ---
> From 865a19b760d2786fe37d3b5c151a4ecea4c0e95e Mon Sep 17 00:00:00 2001
> From: Christoph Hellwig <hch@lst.de>
> Date: Fri, 12 Sep 2014 16:00:19 -0700
> Subject: scsi: fix regression that accidentally disabled block-based tcq
> 
> The scsi blk-mq support accidentally flipped a conditional, which lead to
> never enabling block based tcq when using the legacy request path.
> 
> Fixes: d285203cf647d7c9 scsi: add support for a blk-mq based I/O path.
> Reported-by: Hans de Goede <hdegoede@redhat.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  include/scsi/scsi_tcq.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h
> index cdcc90b..e645835 100644
> --- a/include/scsi/scsi_tcq.h
> +++ b/include/scsi/scsi_tcq.h
> @@ -68,7 +68,7 @@ static inline void scsi_activate_tcq(struct scsi_device *sdev, int depth)
>  		return;
>  
>  	if (!shost_use_blk_mq(sdev->host) &&
> -	    blk_queue_tagged(sdev->request_queue))
> +	    !blk_queue_tagged(sdev->request_queue))
>  		blk_queue_init_tags(sdev->request_queue, depth,
>  				    sdev->host->bqt);
>  
>