From: Robert Baldyga <r.baldyga@samsung.com>
To: balbi@ti.com
Cc: paulz@synopsys.com, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org, m.szyprowski@samsung.com,
        andrzej.p@samsung.com, Kamil Debski <k.debski@samsung.com>,
        Robert Baldyga <r.baldyga@samsung.com>
Subject: [PATCH 01/11] usb: dwc2/gadget: fix phy disable sequence
Date: Mon, 23 Jun 2014 09:51:20 +0200
Message-id: <1403509890-14103-2-git-send-email-r.baldyga@samsung.com>
In-reply-to: <1403509890-14103-1-git-send-email-r.baldyga@samsung.com>
References: <1403509890-14103-1-git-send-email-r.baldyga@samsung.com>
Sender: linux-kernel-owner@vger.kernel.org

From: Kamil Debski <k.debski@samsung.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@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Robert Baldyga <r.baldyga@samsung.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 f3c56a2..ccef3a7 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -2898,8 +2898,6 @@ 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;
 
@@ -3586,7 +3584,6 @@ 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/