Re: Regression: plugging in USB scanner breaks all USB functionality

[Takashi Iwai <tiwai@suse.de>]

On Fri, 03 Dec 2021 11:57:38 +0100,
Mathias Nyman wrote:
> 
> On 2.12.2021 16.55, Robert Munteanu wrote:
> > Hi,
> > 
> > After updating from kernel 5.14.11 to 5.14.14 I am seeing the following
> > problem:
> > 
> > When plugging in an USB scanner ( Brother DSMobile DS-740D ) to my
> > Lenovo P52 laptop I lose connection to all USB devices. Not only are
> > the devices no longer available on the host, but no power is drawn by
> > them. Only a reboot fixes the problem.
> > 
> > The scanner is the only device that triggers the problem, even when it
> > is the only device plugged in. I have a host of other devices,
> > connected either directly or via a USB hub in my monitor:
> > 
> 
> There is one xhci patch in that range that has caused other issues:
> ff0e50d3564f xhci: Fix command ring pointer corruption while aborting a command
> 
> That patch has a fix that is not yet applied, fix can be found here:
> https://lore.kernel.org/linux-usb/20211126122340.1193239-2-mathias.nyman@linux.intel.com/
> or
> https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git/commit/?h=for-usb-linus&id=385b5b09c3546c87cfb730b76abe5f8d73c579a2
> 
> Does reverting the original patch, or applying the fix help?

Thanks!

For convenience, I'm building a test 15.5.x kernel for openSUSE TW in
OBS home:tiwai:bsc1192569 repo.  Robert, if you have time, please test
it later.


Takashi