linux-kernel - [PATCH 5/5] phy: omap-usb2: Balance pm_runtime

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Date:	Thu, 10 Jul 2014 11:55:03 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<gregkh@...uxfoundation.org>
CC:	<kishon@...com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 5/5] phy: omap-usb2: Balance pm_runtime_enable() on probe failure and remove

From: Roger Quadros <rogerq@...com>

If probe fails then we need to call pm_runtime_disable() to balance
out the previous pm_runtime_enable() call. Else it will cause
unbalanced pm_runtime_enable() call in the succeding probe call.

This anomaly was observed when the call to devm_phy_create() failed
with -EPROBE_DEFER.

Balance out the pm_runtime_enable() call in .remove() as well.

Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/phy/phy-omap-usb2.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c
index 2063d54..34b3961 100644
--- a/drivers/phy/phy-omap-usb2.c
+++ b/drivers/phy/phy-omap-usb2.c
@@ -262,7 +262,6 @@ static int omap_usb2_probe(struct platform_device *pdev)
 	otg->phy		= &phy->phy;
 
 	platform_set_drvdata(pdev, phy);
-	pm_runtime_enable(phy->dev);
 
 	generic_phy = devm_phy_create(phy->dev, &ops, NULL);
 	if (IS_ERR(generic_phy))
@@ -270,10 +269,13 @@ static int omap_usb2_probe(struct platform_device *pdev)
 
 	phy_set_drvdata(generic_phy, phy);
 
+	pm_runtime_enable(phy->dev);
 	phy_provider = devm_of_phy_provider_register(phy->dev,
 			of_phy_simple_xlate);
-	if (IS_ERR(phy_provider))
+	if (IS_ERR(phy_provider)) {
+		pm_runtime_disable(phy->dev);
 		return PTR_ERR(phy_provider);
+	}
 
 	phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 	if (IS_ERR(phy->wkupclk)) {
@@ -317,6 +319,7 @@ static int omap_usb2_remove(struct platform_device *pdev)
 	if (!IS_ERR(phy->optclk))
 		clk_unprepare(phy->optclk);
 	usb_remove_phy(&phy->phy);
+	pm_runtime_disable(phy->dev);
 
 	return 0;
 }
-- 
1.7.9.5

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