linux-kernel - [PATCH] phy: samsung_usb2: Fixup samsung_usb2_phy_power

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Message-ID: <1426552958.6645.3.camel@phoenix>
Date:	Tue, 17 Mar 2015 08:42:38 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Kamil Debski <k.debski@...sung.com>, linux-kernel@...r.kernel.org,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>
Subject: [PATCH] phy: samsung_usb2: Fixup samsung_usb2_phy_power_on/off paths

Ensure we have balanced clk_prepare_enable/clk_disable_unprepare calls if
.power_on or .power_off callbacks return error.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
 drivers/phy/phy-samsung-usb2.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/phy-samsung-usb2.c b/drivers/phy/phy-samsung-usb2.c
index 4a12f66..55b6994 100644
--- a/drivers/phy/phy-samsung-usb2.c
+++ b/drivers/phy/phy-samsung-usb2.c
@@ -37,10 +37,14 @@ static int samsung_usb2_phy_power_on(struct phy *phy)
 		spin_lock(&drv->lock);
 		ret = inst->cfg->power_on(inst);
 		spin_unlock(&drv->lock);
+		if (ret)
+			goto err_power_on;
 	}
 
 	return 0;
 
+err_power_on:
+	clk_disable_unprepare(drv->ref_clk);
 err_instance_clk:
 	clk_disable_unprepare(drv->clk);
 err_main_clk:
@@ -51,7 +55,7 @@ static int samsung_usb2_phy_power_off(struct phy *phy)
 {
 	struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
 	struct samsung_usb2_phy_driver *drv = inst->drv;
-	int ret = 0;
+	int ret;
 
 	dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
 		inst->cfg->label);
@@ -59,10 +63,12 @@ static int samsung_usb2_phy_power_off(struct phy *phy)
 		spin_lock(&drv->lock);
 		ret = inst->cfg->power_off(inst);
 		spin_unlock(&drv->lock);
+		if (ret)
+			return ret;
 	}
 	clk_disable_unprepare(drv->ref_clk);
 	clk_disable_unprepare(drv->clk);
-	return ret;
+	return 0;
 }
 
 static struct phy_ops samsung_usb2_phy_ops = {
-- 
1.9.1



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