Re: [REGRESSION] Re: [PATCH 1/3] USB: core: Unite old scheme and new scheme descriptor reads

[Christian Eggers <ceggers@arri.de>]

Hi Alan,

On Monday, 11 December 2023, 17:21:56 CET, Alan Stern wrote:
> On Mon, Dec 11, 2023 at 11:40:38AM +0100, Christian Eggers wrote:
> > Last week I upgraded within the 5.15-stable branch. Since upstream commit
> > 85d07c556216 ("USB: core: Unite old scheme and new scheme descriptor reads"),
> > there are problems detecting a directly attached USB hub. I identified this
> > commit by bisecting and get the same result during upgrading within the 6.1-stable
> > branch.
> > 
> > Hardware: ARMv7 NXP i.MX6ULL with directly attached USB hub (Microchip USB4916).
> > Log messages:
> > 
> > [    6.150881] usb 1-1: new high-speed USB device number 2 using ci_hdrc
> > [    6.215484] usb 1-1: device descriptor read/8, error -71
> > [    6.377532] usb 1-1: device descriptor read/8, error -71
> 
> Is the old_scheme_first module parameter for the usbcore module set?  
> 
> That and the USB_PORT_QUIRK_OLD_SCHEME are the only things I can see 
> which would cause those errors -- and apparently this quirk never gets 
> set in current kernels.
that was the problem! In previous attempts to reduce the boot time of my system
I have set USB_PORT_QUIRK_OLD_SCHEME for specific combinations of bus/port numbers.

After reverting this, the warnings don't appear anymore, so everything is fine now.

Thanks for identifying the problem and sorry for the noise.

regards,
Christian