linux-kernel - [PATCH v2 net] net/sonic: use dma_mapping

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Message-Id: <6645a4b5c1e364312103f48b7b36783b94e197a2.1679370343.git.fthain@linux-m68k.org>
Date:   Tue, 21 Mar 2023 14:45:43 +1100
From:   Finn Thain <fthain@...ux-m68k.org>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zhang Changzhong <zhangchangzhong@...wei.com>
Subject: [PATCH v2 net] net/sonic: use dma_mapping_error() for error check

From: Zhang Changzhong <zhangchangzhong@...wei.com>

The DMA address returned by dma_map_single() should be checked with
dma_mapping_error(). Fix it accordingly.

Fixes: efcce839360f ("[PATCH] macsonic/jazzsonic network drivers update")
Signed-off-by: Zhang Changzhong <zhangchangzhong@...wei.com>
Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...ux-m68k.org>
---
This was originally Zhang Changzhong's patch. I've just added the missing
curly bracket which caused a build failure when the patch was first posted.
---
 drivers/net/ethernet/natsemi/sonic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/natsemi/sonic.c b/drivers/net/ethernet/natsemi/sonic.c
index d17d1b4f2585..825356ee3492 100644
--- a/drivers/net/ethernet/natsemi/sonic.c
+++ b/drivers/net/ethernet/natsemi/sonic.c
@@ -292,7 +292,7 @@ static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
 	 */
 
 	laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
-	if (!laddr) {
+	if (dma_mapping_error(lp->device, laddr)) {
 		pr_err_ratelimited("%s: failed to map tx DMA buffer.\n", dev->name);
 		dev_kfree_skb_any(skb);
 		return NETDEV_TX_OK;
@@ -509,7 +509,7 @@ static bool sonic_alloc_rb(struct net_device *dev, struct sonic_local *lp,
 
 	*new_addr = dma_map_single(lp->device, skb_put(*new_skb, SONIC_RBSIZE),
 				   SONIC_RBSIZE, DMA_FROM_DEVICE);
-	if (!*new_addr) {
+	if (dma_mapping_error(lp->device, *new_addr)) {
 		dev_kfree_skb(*new_skb);
 		*new_skb = NULL;
 		return false;
-- 
2.37.5