Re: em28xx breaks after hibernate

[Mauro Carvalho Chehab <mchehab@osg.samsung.com>]

Em Fri, 26 Sep 2014 14:27:21 +0200
Johannes Stezenbach <js@linuxtv.org> escreveu:

> On Fri, Sep 26, 2014 at 09:03:16AM -0300, Mauro Carvalho Chehab wrote:
> > 
> > The patch I sent you (or some fixed version of it) is part of the
> > solution, but this still bothers me:
> > 
> > > > [    3.776854]  [<ffffffff813f974f>] drxk_attach+0x546/0x656
> > > > [    3.777675]  [<ffffffff814c22a3>] em28xx_dvb_init.part.3+0xa3e/0x1cdf
> > > > [    3.778652]  [<ffffffff8106555c>] ? trace_hardirqs_on_caller+0x183/0x19f
> > > > [    3.779690]  [<ffffffff81065585>] ? trace_hardirqs_on+0xd/0xf
> > > > [    3.780615]  [<ffffffff814c5b45>] ? mutex_unlock+0x9/0xb
> > > > [    3.781428]  [<ffffffff814c0f50>] ? em28xx_v4l2_init.part.11+0xcbd/0xd04
> > > > [    3.782487]  [<ffffffff814230cf>] em28xx_dvb_init+0x1d/0x1f
> > 
> > Why em28xx_dvb_init() is being called?
> > 
> > That should only happen if the device is re-probed again, but
> > the reset_resume code should have been preventing it.
> 
> Well, I stuck a WARN_ON(1) into drxk_release(), it is not called
> during hibernate+resume.

Well, it shouldn't be called at hibernate, but, at resume, the
reset_resume callback at em28xx should have been called, but I'm
not seeing any message indicating it.

Try to add a WARN_ON or printk at em28xx_usb_resume().


> Do you have a better suggestion to debug it?
> 
> Johannes