netdev - [patch] can: c_can: precedence error in c_can_chip

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Message-ID: <20120609155150.GA6488@elgon.mountain>
Date:	Sat, 9 Jun 2012 18:56:45 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Wolfgang Grandegger <wg@...ndegger.com>
Cc:	Marc Kleine-Budde <mkl@...gutronix.de>,
	AnilKumar Ch <anilkumar@...com>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Kosina <jkosina@...e.cz>, linux-can@...r.kernel.org,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] can: c_can: precedence error in c_can_chip_config()

(CAN_CTRLMODE_LISTENONLY & CAN_CTRLMODE_LOOPBACK) is (0x02 & 0x01) which
is zero so the condition is never true.  The intent here was to test
that both flags were set.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
This is a static checker fix.  I'm not super familiar with the c_can
code.

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index e2ce508..eea6608 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -594,8 +594,8 @@ static void c_can_chip_config(struct net_device *dev)
 	priv->write_reg(priv, C_CAN_CTRL_REG,
 			CONTROL_ENABLE_AR);
 
-	if (priv->can.ctrlmode & (CAN_CTRLMODE_LISTENONLY &
-					CAN_CTRLMODE_LOOPBACK)) {
+	if ((priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) &&
+	    (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)) {
 		/* loopback + silent mode : useful for hot self-test */
 		priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_EIE |
 				CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
--
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