nvme: use an integer value to Linux errno values

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@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index fce353ba5f66cc5b4ee73f73970cc8d1bd84ce24..84e4a80883867e6266149bf2d8fa6e4a280b9895 100644 (file)
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -603,8 +603,8 @@ 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 = 0;
 
        if (unlikely(status)) {
                if (!(status & NVME_SC_DNR || blk_noretry_request(req))
@@ -621,9 +621,11 @@ 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);
                }
        }
 
@@ -635,7 +637,7 @@ 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,
@@ -649,7 +651,7 @@ 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. */