linux-kernel - [PATCH 4.14 30/77] net: phy: meson-gxl: check phy

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Date:   Fri, 23 Mar 2018 10:54:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Jerome Brunet <jbrunet@...libre.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 30/77] net: phy: meson-gxl: check phy_write return value

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jerome Brunet <jbrunet@...libre.com>


[ Upstream commit 9042b46eda33ef5db3cdfc9e12b3c8cabb196141 ]

Always check phy_write return values. Better to be safe than sorry

Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/phy/meson-gxl.c |   50 +++++++++++++++++++++++++++++++++-----------
 1 file changed, 38 insertions(+), 12 deletions(-)

--- a/drivers/net/phy/meson-gxl.c
+++ b/drivers/net/phy/meson-gxl.c
@@ -25,27 +25,53 @@
 
 static int meson_gxl_config_init(struct phy_device *phydev)
 {
+	int ret;
+
 	/* Enable Analog and DSP register Bank access by */
-	phy_write(phydev, 0x14, 0x0000);
-	phy_write(phydev, 0x14, 0x0400);
-	phy_write(phydev, 0x14, 0x0000);
-	phy_write(phydev, 0x14, 0x0400);
+	ret = phy_write(phydev, 0x14, 0x0000);
+	if (ret)
+		return ret;
+	ret = phy_write(phydev, 0x14, 0x0400);
+	if (ret)
+		return ret;
+	ret = phy_write(phydev, 0x14, 0x0000);
+	if (ret)
+		return ret;
+	ret = phy_write(phydev, 0x14, 0x0400);
+	if (ret)
+		return ret;
 
 	/* Write Analog register 23 */
-	phy_write(phydev, 0x17, 0x8E0D);
-	phy_write(phydev, 0x14, 0x4417);
+	ret = phy_write(phydev, 0x17, 0x8E0D);
+	if (ret)
+		return ret;
+	ret = phy_write(phydev, 0x14, 0x4417);
+	if (ret)
+		return ret;
 
 	/* Enable fractional PLL */
-	phy_write(phydev, 0x17, 0x0005);
-	phy_write(phydev, 0x14, 0x5C1B);
+	ret = phy_write(phydev, 0x17, 0x0005);
+	if (ret)
+		return ret;
+	ret = phy_write(phydev, 0x14, 0x5C1B);
+	if (ret)
+		return ret;
 
 	/* Program fraction FR_PLL_DIV1 */
-	phy_write(phydev, 0x17, 0x029A);
-	phy_write(phydev, 0x14, 0x5C1D);
+	ret = phy_write(phydev, 0x17, 0x029A);
+	if (ret)
+		return ret;
+	ret = phy_write(phydev, 0x14, 0x5C1D);
+	if (ret)
+		return ret;
 
 	/* Program fraction FR_PLL_DIV1 */
-	phy_write(phydev, 0x17, 0xAAAA);
-	phy_write(phydev, 0x14, 0x5C1C);
+	ret = phy_write(phydev, 0x17, 0xAAAA);
+	if (ret)
+		return ret;
+	ret = phy_write(phydev, 0x14, 0x5C1C);
+	if (ret)
+		return ret;
 
 	return 0;
 }