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

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Date:	Wed, 27 Feb 2013 09:52:38 +0200
From:	Roger Quadros <rogerq@...com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	<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 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.

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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