linux-kernel - [PATCH] peak_usb: fix clang build warning

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Date:   Thu,  7 Mar 2019 11:31:55 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] peak_usb: fix clang build warning

Clang points out undefined behavior when building the pcan_usb_pro driver:

drivers/net/can/usb/peak_usb/pcan_usb_pro.c:136:15: error: passing an object that undergoes default argument promotion to 'va_start' has undefined behavior [-Werror,-Wvarargs]

Changing the function prototype to avoid argument promotion in the
varargs call avoids the warning, and should make this well-defined.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/can/usb/peak_usb/pcan_usb_pro.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
index d516def846ab..b388406ac0f5 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -127,7 +127,7 @@ static u8 *pcan_msg_init_empty(struct pcan_usb_pro_msg *pm,
 /*
  * add one record to a message being built
  */
-static int pcan_msg_add_rec(struct pcan_usb_pro_msg *pm, u8 id, ...)
+static int pcan_msg_add_rec(struct pcan_usb_pro_msg *pm, int id, ...)
 {
 	int len, i;
 	u8 *pc;
-- 
2.20.0