linux-kernel - [PATCH v2 2/2] can: bcm: check the result of can_send() in bcm_can

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Message-ID: <9851878e74d6d37aee2f1ee76d68361a46f89458.1663206163.git.william.xuanziyang@huawei.com>
Date:   Thu, 15 Sep 2022 09:55:56 +0800
From:   Ziyang Xuan <william.xuanziyang@...wei.com>
To:     <socketcan@...tkopp.net>, <mkl@...gutronix.de>,
        <davem@...emloft.net>, <kuba@...nel.org>,
        <linux-can@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 2/2] can: bcm: check the result of can_send() in bcm_can_tx()

If can_send() fail, it should not update frames_abs counter
in bcm_can_tx(). Add the result check for can_send() in bcm_can_tx().

Suggested-by: Marc Kleine-Budde <mkl@...gutronix.de>
Suggested-by: Oliver Hartkopp <socketcan@...tkopp.net>
Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
---
 net/can/bcm.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/can/bcm.c b/net/can/bcm.c
index e2783156bfd1..a571c8d4338b 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -274,6 +274,7 @@ static void bcm_can_tx(struct bcm_op *op)
 	struct sk_buff *skb;
 	struct net_device *dev;
 	struct canfd_frame *cf = op->frames + op->cfsiz * op->currframe;
+	int err;
 
 	/* no target device? => exit */
 	if (!op->ifindex)
@@ -298,11 +299,11 @@ static void bcm_can_tx(struct bcm_op *op)
 	/* send with loopback */
 	skb->dev = dev;
 	can_skb_set_owner(skb, op->sk);
-	can_send(skb, 1);
+	err = can_send(skb, 1);
+	if (!err)
+		op->frames_abs++;
 
-	/* update statistics */
 	op->currframe++;
-	op->frames_abs++;
 
 	/* reached last frame? */
 	if (op->currframe >= op->nframes)
-- 
2.25.1