Re: stopping and starting a functionfs USB-device causes panic

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On Fri, Nov 03, 2017 at 10:13:17PM +0000, andy_purcell@xxxxxxxxxxxx wrote:
> Hello Felipe,
> 
> > >
> > > I have a second issue with a functionfs USB-device implementation.
> > >
> > > The scenario is this:
> > > 1) USB-device app starts up, runs fine
> > > 2) ssh to the device, kill the app with CTRL-C
> > > 3) try to start the USB-device app 2nd time
> > >
> > > PANIC
> > >
> > > dmesg output:
> > > [ 2553.870000] ------------[ cut here ]------------ [ 2553.870000]
> > > kernel BUG at /var/lib/jenkins/workspace/Complete_PXYZ/.../kernel-
> > source/fs/sysfs/file.c:332!
> > >
> > > [ 2553.870000] Internal error: Oops - BUG: 0 [#1] PREEMPT ARM [
> > > 2553.870000] Modules linked in: designware_udc usb_f_fs libcomposite
> > > udc_core fuse configfs autofs4
> > 
> > what is this designware_udc? We don't have that in mainline
> 
> It is a driver for a very old ST Micro processor. 

Ah, that's the issue here.  You are going to have to get support from
the company that is forcing you to use this driver, you are already
paying them for it, so please take advantage of it.  There's nothing
that we can do here for you :(

best of luck!

greg k-h
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