[PATCH] nvme: use an integer value to Linux errno values

[hch@infradead.org (Christoph Hellwig)]

Can I get a review for this one?  This is something that should probably
got to Linus for 4.3.

On Mon, Oct 12, 2015@09:23:39PM +0200, Christoph Hellwig wrote:
> Use a separate integer variable to hold the signed Linux errno
> values we pass back to the block layer.  Note that for pass through
> commands those might still be NVMe values, but those fit into the
> int as well.
> 
> Fixes: f4829a9b7a61: ("blk-mq: fix racy updates of rq->errors")
> Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---
>  drivers/nvme/host/pci.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index a526696..9049888 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -606,8 +606,8 @@ static void req_completion(struct nvme_queue *nvmeq, void *ctx,
>  	struct nvme_iod *iod = ctx;
>  	struct request *req = iod_get_private(iod);
>  	struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req);
> -
>  	u16 status = le16_to_cpup(&cqe->status) >> 1;
> +	int error;
>  
>  	if (unlikely(status)) {
>  		if (!(status & NVME_SC_DNR || blk_noretry_request(req))
> @@ -624,9 +624,11 @@ static void req_completion(struct nvme_queue *nvmeq, void *ctx,
>  
>  		if (req->cmd_type == REQ_TYPE_DRV_PRIV) {
>  			if (cmd_rq->ctx == CMD_CTX_CANCELLED)
> -				status = -EINTR;
> +				error = -EINTR;
> +			else
> +				error = status;
>  		} else {
> -			status = nvme_error_status(status);
> +			error = nvme_error_status(status);
>  		}
>  	}
>  
> @@ -638,7 +640,7 @@ static void req_completion(struct nvme_queue *nvmeq, void *ctx,
>  	if (cmd_rq->aborted)
>  		dev_warn(nvmeq->dev->dev,
>  			"completing aborted command with status:%04x\n",
> -			status);
> +			error);
>  
>  	if (iod->nents) {
>  		dma_unmap_sg(nvmeq->dev->dev, iod->sg, iod->nents,
> @@ -652,7 +654,7 @@ static void req_completion(struct nvme_queue *nvmeq, void *ctx,
>  	}
>  	nvme_free_iod(nvmeq->dev, iod);
>  
> -	blk_mq_complete_request(req, status);
> +	blk_mq_complete_request(req, error);
>  }
>  
>  /* length is in bytes.  gfp flags indicates whether we may sleep. */
> -- 
> 1.9.1
> 
> 
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---end quoted text---