linux-kernel - [PATCH 20/28] net: bcm63xx: avoid referencing uninitialized variable

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Date:   Tue, 18 Oct 2016 00:16:08 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Philippe Reynes <tremyfr@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 20/28] net: bcm63xx: avoid referencing uninitialized variable

gcc found a reference to an uninitialized variable in the error handling
of bcm_enet_open, introduced by a recent cleanup:

drivers/net/ethernet/broadcom/bcm63xx_enet.c: In function 'bcm_enet_open'
drivers/net/ethernet/broadcom/bcm63xx_enet.c:1129:2: warning: 'phydev' may be used uninitialized in this function [-Wmaybe-uninitialized]

This makes the use of that variable conditional, so we only reference it
here after it has been used before. Unlike my normal patches, I have not
build-tested this one, as I don't currently have mips test in my
randconfig setup.

Fixes: 625eb8667d6f ("net: ethernet: broadcom: bcm63xx: use phydev from struct net_device")
Cc: Philippe Reynes <tremyfr@...il.com>
Reported-by: kbuild test robot <fengguang.wu@...el.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/ethernet/broadcom/bcm63xx_enet.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
index ae364c7..5370909 100644
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -1126,7 +1126,8 @@ static int bcm_enet_open(struct net_device *dev)
 	free_irq(dev->irq, dev);
 
 out_phy_disconnect:
-	phy_disconnect(phydev);
+	if (priv->has_phy)
+		phy_disconnect(phydev);
 
 	return ret;
 }
-- 
2.9.0