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

[Mathias Nyman]

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@xxxxxxxxxxxxxxx/
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
-Mathias