From: Jian Shen <shenjian15@huawei.com>
Date: Fri, 21 Sep 2018 16:41:44 +0100
Subject: net: hns3: Add unlikely for dma_mapping_error check
Patch-mainline: v4.20-rc1
Git-commit: 2211f4e1955f11df5fe8df24f5eeda5a5bbe6748
References: bsc#1104353 FATE#326415

For dma_mapping_error is unlikely happened, this patch adds unlikely for
dma_mapping_error check.

Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1807,7 +1807,7 @@ static int hns3_map_buffer(struct hns3_e
 	cb->dma = dma_map_page(ring_to_dev(ring), cb->priv, 0,
 			       cb->length, ring_to_dma_dir(ring));
 
-	if (dma_mapping_error(ring_to_dev(ring), cb->dma))
+	if (unlikely(dma_mapping_error(ring_to_dev(ring), cb->dma)))
 		return -EIO;
 
 	return 0;