linux-kernel - Re: [ 79/86] USB: ehci-omap: Dont free gpios that we didnt request

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Date:	Wed, 27 Feb 2013 17:20:59 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	Roger Quadros <rogerq@...com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Felipe Balbi <balbi@...com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [ 79/86] USB: ehci-omap: Dont free gpios that we didnt request

Hi Roger,

On Wed, Feb 27, 2013 at 09:52:38AM +0200, Roger Quadros wrote:
> Hi Greg,
> 
> On 02/27/2013 02:08 AM, Greg Kroah-Hartman wrote:
> > 3.4-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Roger Quadros <rogerq@...com>
> > 
> > commit 428525f97153505e83983460a8d08a3210aa6b8a upstream.
> > 
> > This driver does not request any gpios so don't free them.
> > Fixes L3 bus error on multiple modprobe/rmmod of ehci_hcd
> > with ehci-omap in use.
> 
> Please drop this patch from 3.4-stable.
> 
> In 3.4, the driver requests the gpios in probe() so they must be freed
> in remove() and this patch should not be applied. Thanks.

I believe this is also true for the 3.5 kernels.  Can you confirm this?

Cheers,
--
Luis

> 
> cheers, -roger
> 
> > 
> > Without this patch, EHCI will break on repeated insmod/rmmod
> > of ehci_hcd for all OMAP2+ platforms that use EHCI and
> > set 'phy_reset = true' in usbhs_omap_board_data.
> > i.e.
> > 
> > board-3430sdp.c:	.phy_reset  = true,
> > board-3630sdp.c:	.phy_reset  = true,
> > board-am3517crane.c:	.phy_reset  = true,
> > board-am3517evm.c:	.phy_reset  = true,
> > board-cm-t3517.c:	.phy_reset  = true,
> > board-cm-t35.c:	.phy_reset  = true,
> > board-devkit8000.c:	.phy_reset  = true,
> > board-igep0020.c:	.phy_reset = true,
> > board-igep0020.c:	.phy_reset = true,
> > board-omap3beagle.c:	.phy_reset  = true,
> > board-omap3evm.c:	.phy_reset  = true,
> > board-omap3pandora.c:	.phy_reset  = true,
> > board-omap3stalker.c:	.phy_reset = true,
> > board-omap3touchbook.c:	.phy_reset  = true,
> > board-omap4panda.c:	.phy_reset  = false,
> > board-overo.c:	.phy_reset  = true,
> > board-zoom.c:	.phy_reset		= true,
> > 
> > Signed-off-by: Roger Quadros <rogerq@...com>
> > Reviewed-by: Felipe Balbi <balbi@...com>
> > Acked-by: Alan Stern <stern@...land.harvard.edu>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > 
> > ---
> >  drivers/usb/host/ehci-omap.c |    8 --------
> >  1 file changed, 8 deletions(-)
> > 
> > --- a/drivers/usb/host/ehci-omap.c
> > +++ b/drivers/usb/host/ehci-omap.c
> > @@ -288,7 +288,6 @@ static int ehci_hcd_omap_remove(struct p
> >  {
> >  	struct device *dev				= &pdev->dev;
> >  	struct usb_hcd *hcd				= dev_get_drvdata(dev);
> > -	struct ehci_hcd_omap_platform_data *pdata	= dev->platform_data;
> >  
> >  	usb_remove_hcd(hcd);
> >  	disable_put_regulator(dev->platform_data);
> > @@ -297,13 +296,6 @@ static int ehci_hcd_omap_remove(struct p
> >  	pm_runtime_put_sync(dev);
> >  	pm_runtime_disable(dev);
> >  
> > -	if (pdata->phy_reset) {
> > -		if (gpio_is_valid(pdata->reset_gpio_port[0]))
> > -			gpio_free(pdata->reset_gpio_port[0]);
> > -
> > -		if (gpio_is_valid(pdata->reset_gpio_port[1]))
> > -			gpio_free(pdata->reset_gpio_port[1]);
> > -	}
> >  	return 0;
> >  }
> >  
> > 
> > 
> 
> --
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