linux-kernel - [PATCH] phy: lpc18xx-usb-otg: error handling in lpc18xx_usb_otg_phy_power

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Date:   Fri, 23 Feb 2018 00:40:11 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Joachim Eastwood <manabian@...il.com>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        ldv-project@...uxtesting.org
Subject: [PATCH] phy: lpc18xx-usb-otg: error handling in lpc18xx_usb_otg_phy_power_on()

If regmap_update_bits() fails in lpc18xx_usb_otg_phy_power_on(),
lpc->clk is left enabled.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/phy/phy-lpc18xx-usb-otg.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/phy-lpc18xx-usb-otg.c b/drivers/phy/phy-lpc18xx-usb-otg.c
index 3b7a71eb5b7e..7de280a45421 100644
--- a/drivers/phy/phy-lpc18xx-usb-otg.c
+++ b/drivers/phy/phy-lpc18xx-usb-otg.c
@@ -60,8 +60,14 @@ static int lpc18xx_usb_otg_phy_power_on(struct phy *phy)
 		return ret;
 
 	/* The bit in CREG is cleared to enable the PHY */
-	return regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
+	ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
 				  LPC18XX_CREG_CREG0_USB0PHY, 0);
+	if (ret) {
+		clk_disable(lpc->clk);
+		return ret;
+	}
+
+	return 0;
 }
 
 static int lpc18xx_usb_otg_phy_power_off(struct phy *phy)
-- 
2.7.4