linux-kernel - [PATCH RESEND v3 01/12] usb: dwc2/gadget: fix phy disable sequence

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Date:	Tue, 19 Aug 2014 10:54:07 +0200
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	Paul.Zimmerman@...opsys.com
Cc:	gregkh@...uxfoundation.org, balbi@...com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	m.szyprowski@...sung.com, andrzej.p@...sung.com,
	Kamil Debski <k.debski@...sung.com>,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH RESEND v3 01/12] usb: dwc2/gadget: fix phy disable sequence

From: Kamil Debski <k.debski@...sung.com>

When the driver is removed s3c_hsotg_phy_disable is called three times
instead of once. This results in decreasing of the phy reference counter
below zero and thus consecutive inserts of the module fails.

This patch removes calls to s3c_hsotg_phy_disable from s3c_hsotg_remove
and s3c_hsotg_udc_stop.

s3c_hsotg_udc_stop is called from udc-core.c only after
usb_gadget_disconnect, which in turn calls s3c_hsotg_pullup, which
already calls s3c_hsotg_phy_disable.

s3c_hsotg_remove must be called only after udc_stop, so there is no
point in disabling phy once again there.

Signed-off-by: Kamil Debski <k.debski@...sung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---
 drivers/usb/dwc2/gadget.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 0ba9c33..d27417e 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -2897,8 +2897,6 @@ static int s3c_hsotg_udc_stop(struct usb_gadget *gadget,
 
 	spin_lock_irqsave(&hsotg->lock, flags);
 
-	s3c_hsotg_phy_disable(hsotg);
-
 	if (!driver)
 		hsotg->driver = NULL;
 
@@ -3582,7 +3580,6 @@ static int s3c_hsotg_remove(struct platform_device *pdev)
 		usb_gadget_unregister_driver(hsotg->driver);
 	}
 
-	s3c_hsotg_phy_disable(hsotg);
 	if (hsotg->phy)
 		phy_exit(hsotg->phy);
 	clk_disable_unprepare(hsotg->clk);
-- 
1.9.1

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