linux-kernel - [patch added to the 3.12 stable tree] stmmac: fix check for phydev being open

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Message-Id: <1443607226-15456-18-git-send-email-jslaby@suse.cz>
Date:	Wed, 30 Sep 2015 12:00:13 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	Alexey Brodkin <abrodkin@...opsys.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [patch added to the 3.12 stable tree] stmmac: fix check for phydev being open

From: Alexey Brodkin <Alexey.Brodkin@...opsys.com>

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

===============

commit dfc50fcaad574e5c8c85cbc83eca1426b2413fa4 upstream.

Current check of phydev with IS_ERR(phydev) may make not much sense
because of_phy_connect() returns NULL on failure instead of error value.

Still for checking result of phy_connect() IS_ERR() makes perfect sense.

So let's use combined check IS_ERR_OR_NULL() that covers both cases.

Cc: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
Cc: linux-kernel@...r.kernel.org
Cc: David Miller <davem@...emloft.net>
Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 8d4ccd35a016..14c0d31c10ad 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -801,8 +801,11 @@ static int stmmac_init_phy(struct net_device *dev)
 
 	phydev = phy_connect(dev, phy_id_fmt, &stmmac_adjust_link, interface);
 
-	if (IS_ERR(phydev)) {
+	if (IS_ERR_OR_NULL(phydev)) {
 		pr_err("%s: Could not attach to PHY\n", dev->name);
+		if (!phydev)
+			return -ENODEV;
+
 		return PTR_ERR(phydev);
 	}
 
-- 
2.6.0

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