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

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Message-ID: <20131127173904.GD8123@saruman.home>
Date:	Wed, 27 Nov 2013 11:39:04 -0600
From:	Felipe Balbi <balbi@...com>
To:	Pali Rohár <pali.rohar@...il.com>
CC:	<balbi@...com>, 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

Hi,

On Wed, Nov 27, 2013 at 05:40:42PM +0100, Pali Rohár wrote:
> > > > > @@ -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.
> > > 
> > > yeah, makes sense. We shouldn't call phy operations in
> > > atomic context. I'll see how easy it would be to fix that.
> > > Real patch coming soon(-ish).
> > 
> > I think we could send diff below for the -rc cycle and figure
> > out a better to handle this for the merge window. Can you
> > check if it also works with patch below ?
> > 
> > diff --git a/drivers/usb/musb/omap2430.c
> > b/drivers/usb/musb/omap2430.c index 2a408cd..8aa59a2 100644
> > --- a/drivers/usb/musb/omap2430.c
> > +++ b/drivers/usb/musb/omap2430.c
> > @@ -659,7 +659,6 @@ static int omap2430_runtime_suspend(struct
> > device *dev) OTG_INTERFSEL);
> > 
> >  		omap2430_low_level_exit(musb);
> > -		phy_power_off(musb->phy);
> >  	}
> > 
> >  	return 0;
> > @@ -674,7 +673,6 @@ static int omap2430_runtime_resume(struct
> > device *dev) omap2430_low_level_init(musb);
> >  		musb_writel(musb->mregs, OTG_INTERFSEL,
> >  				musb->context.otg_interfsel);
> > -		phy_power_on(musb->phy);
> >  	}
> > 
> >  	return 0;
> 
> Hi, I applied similar patch (commented usb_phy_set_suspend 
> instead phy_power_on/off) on 3.12-rc5 and it working too, no 
> crash. I do not have rebased n900 patches on top of 3.13 tree, so 
> I cannot check it. But I think phy_power_on/off doing same as 
> usb_phy_set_suspend in 3.12.

cool, I'll send this during the -rc and Cc stable, then I'll manually
backport it to stable later.

-- 
balbi

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