[PATCH v2 1/1] nvme-rdma: fix -EIO cleanup order in queue_rq

[Xixin Liu]

On -EIO, the RDMA queue_rq path reports a host path error and then
still cleans up the command and unmaps the SQE DMA. The path error
helper completes the request, so that is double cleanup and DMA unmap
after the request is already complete.

Unmap the SQE first, then report the host path error. Skip the outer
command cleanup on that path.

Fixes: 62eca39722fd ("nvme-rdma: handle nvme_rdma_post_send failures better")
Signed-off-by: Xixin Liu <liuxixin@xxxxxxxxxx>
---
 drivers/nvme/host/rdma.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 56cd228af1d5..a1b2c3d4e5f6 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -2005,7 +2005,7 @@ static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
 	struct ib_device *dev;
 	bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);
 	blk_status_t ret;
-	int err;
+	int err = 0;
 
 	WARN_ON_ONCE(rq->tag < 0);
 
@@ -2061,16 +2061,18 @@ static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
 err_unmap:
 	nvme_rdma_unmap_data(queue, rq);
 err:
-	if (err == -EIO)
-		ret = nvme_host_path_error(rq);
-	else if (err == -ENOMEM || err == -EAGAIN)
-		ret = BLK_STS_RESOURCE;
-	else
-		ret = BLK_STS_IOERR;
-	nvme_cleanup_cmd(rq);
+	if (err != -EIO) {
+		nvme_cleanup_cmd(rq);
+		if (err == -ENOMEM || err == -EAGAIN)
+			ret = BLK_STS_RESOURCE;
+		else
+			ret = BLK_STS_IOERR;
+	}
 unmap_qe:
 	ib_dma_unmap_single(dev, req->sqe.dma, sizeof(struct nvme_command),
 			    DMA_TO_DEVICE);
+	if (err == -EIO)
+		return nvme_host_path_error(rq);
 	return ret;
 }
 
-- 
2.53.0