linux-kernel - [PATCH 1/2] nvme-rdma: Fix error check for ib_dma_map

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Date:   Thu, 25 Aug 2022 08:47:46 +0200
From:   Jack Wang <jinpu.wang@...os.com>
To:     hch@...radead.org, axboe@...nel.dk, linux-nvme@...ts.infradead.org
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] nvme-rdma: Fix error check for ib_dma_map_sg

ib_dma_map_sg return 0 on error.

Cc: Keith Busch <kbusch@...nel.org>
Cc: Jens Axboe <axboe@...com>
Cc: Christoph Hellwig <hch@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>
Cc: linux-nvme@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Fixes: 711023071960 ("nvme-rdma: add a NVMe over Fabrics RDMA host driver")
Signed-off-by: Jack Wang <jinpu.wang@...os.com>
---
 drivers/nvme/host/rdma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 3100643be299..d70bccbcba3e 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -1551,7 +1551,7 @@ static int nvme_rdma_dma_map_req(struct ib_device *ibdev, struct request *rq,
 
 	*count = ib_dma_map_sg(ibdev, req->data_sgl.sg_table.sgl,
 			       req->data_sgl.nents, rq_dma_dir(rq));
-	if (unlikely(*count <= 0)) {
+	if (unlikely(!*count)) {
 		ret = -EIO;
 		goto out_free_table;
 	}
@@ -1574,7 +1574,7 @@ static int nvme_rdma_dma_map_req(struct ib_device *ibdev, struct request *rq,
 					  req->metadata_sgl->sg_table.sgl,
 					  req->metadata_sgl->nents,
 					  rq_dma_dir(rq));
-		if (unlikely(*pi_count <= 0)) {
+		if (unlikely(!*pi_count)) {
 			ret = -EIO;
 			goto out_free_pi_table;
 		}
-- 
2.34.1