NVMe: Check for DMA mapping failure

If dma_map_sg returns 0 (failure), we need to fail the I/O.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c
index 2948043483fe..bfdca3a3a41a 100644
--- a/drivers/block/nvme.c
+++ b/drivers/block/nvme.c
@@ -451,7 +451,8 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
                 dma_dir = DMA_FROM_DEVICE;
         }
 
-        nvme_map_bio(nvmeq->q_dmadev, nbio, bio, dma_dir, psegs);
+        if (nvme_map_bio(nvmeq->q_dmadev, nbio, bio, dma_dir, psegs) == 0)
+                goto mapping_failed;
 
         cmnd->rw.flags = 1;
         cmnd->rw.command_id = cmdid;
@@ -471,6 +472,11 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
 
         return 0;
 
+ mapping_failed:
+        free_nbio(nvmeq, nbio);
+        bio_endio(bio, -ENOMEM);
+        return 0;
+
  free_nbio:
         free_nbio(nvmeq, nbio);
  congestion: