linux-kernel - Re: BUG: usb: obex in g_nokia.ko causing kernel panic

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Message-Id: <201311261910.08537@pali>
Date:	Tue, 26 Nov 2013 19:10:08 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	balbi@...com
Cc:	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>,
	Aaro Koskinen <aaro.koskinen@....fi>, freemangordon@....bg,
	Sebastian Reichel <sre@...g0.de>
Subject: Re: BUG: usb: obex in g_nokia.ko causing kernel panic

On Tuesday 26 November 2013 18:39:54 Felipe Balbi wrote:
> Hi,
> 
> On Tue, Nov 26, 2013 at 06:28:05PM +0100, Pali Rohár wrote:
> 
> [ snip ]
> 
> > > > (above dump is from 3.12-rc5 kernel)
> > > 
> > > looks like it's trying to do i2c transfers from atomic.
> > > But why only when obex is enabled ? Makes no sense. What
> > > do you have on userland ? Is there anything trying to
> > > access the obex interface ? Was the USB cable attached at
> > > that time ?
> > 
> > Yes, only when initliaizing obex. Other is ok. Problem is
> > there with Maemo userland and also with clean userland
> > (rescueOS) where is only busybox and some simple init
> > scripts. On Maemo maybe something is trying to access obex,
> > but on rescueOS for sure nothing. Problem happends when
> > cable is attached and also when not = always.
> 
> As a debug effort, can you apply hack below and see if it
> "helps" ?
> 
> diff --git a/drivers/usb/gadget/f_obex.c
> b/drivers/usb/gadget/f_obex.c index ad39f1d..4af2f06 100644
> --- a/drivers/usb/gadget/f_obex.c
> +++ b/drivers/usb/gadget/f_obex.c
> @@ -267,10 +267,12 @@ static void obex_connect(struct gserial
> *g) if (!obex->can_activate)
>  		return;
> 
> +#if 0
>  	status = usb_function_activate(&g->func);
>  	if (status)
>  		DBG(cdev, "obex ttyGS%d function activate --> %d\n",
>  			obex->port_num, status);
> +#endif
>  }
> 
>  static void obex_disconnect(struct gserial *g)
> @@ -282,10 +284,12 @@ static void obex_disconnect(struct
> gserial *g) if (!obex->can_activate)
>  		return;
> 
> +#if 0
>  	status = usb_function_deactivate(&g->func);
>  	if (status)
>  		DBG(cdev, "obex ttyGS%d function deactivate --> %d\n",
>  			obex->port_num, status);
> +#endif
>  }
> 
>  /*-----------------------------------------------------------
> --------------*/ @@ -372,6 +376,7 @@ static int
> obex_bind(struct usb_configuration *c, struct usb_function
> *f) if (status)
>  		goto fail;
> 
> +#if 0
>  	/* Avoid letting this gadget enumerate until the userspace
>  	 * OBEX server is active.
>  	 */
> @@ -381,6 +386,7 @@ static int obex_bind(struct
> usb_configuration *c, struct usb_function *f) obex->port_num,
> status);
>  	else
>  		obex->can_activate = true;
> +#endif
> 
> 
>  	DBG(cdev, "obex ttyGS%d: %s speed IN/%s OUT/%s\n",

Hi, with above patch g_nokia.ko working and not crashing.

-- 
Pali Rohár
pali.rohar@...il.com

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