Re: regression from 6.12.48 to 6.12.49: usb wlan adaptor stops working: bisected

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Fri, Sep 26, 2025 at 05:54:00PM +0200, Wolfgang Walter wrote:
> Hello,o
> after upgrading to 6.12.49 my wlan adapter stops working. It is detected:
> 
> kernel: mt76x2u 4-2:1.0: ASIC revision: 76120044
> kernel: mt76x2u 4-2:1.0: ROM patch build: 20141115060606a
> kernel: usb 3-4: reset high-speed USB device number 2 using xhci_hcd
> kernel: mt76x2u 4-2:1.0: Firmware Version: 0.0.00
> kernel: mt76x2u 4-2:1.0: Build: 1
> kernel: mt76x2u 4-2:1.0: Build Time: 201507311614____
> 
> but does nor work. The following 2 messages probably are relevant:
> 
> kernel: mt76x2u 4-2:1.0: MAC RX failed to stop
> kernel: mt76x2u 4-2:1.0: MAC RX failed to stop
> 
> later I see a lot of
> 
> kernel: mt76x2u 4-2:1.0: error: mt76x02u_mcu_wait_resp failed with -110
> 
> 
> I bisected it down to commit
> 
> 9b28ef1e4cc07cdb35da257aa4358d0127168b68
> usb: xhci: remove option to change a default ring's TRB cycle bit
> 
> 
> 9b28ef1e4cc07cdb35da257aa4358d0127168b68 is the first bad commit
> commit 9b28ef1e4cc07cdb35da257aa4358d0127168b68
> Author: Niklas Neronin <niklas.neronin@linux.intel.com>
> Date:   Wed Sep 17 08:39:07 2025 -0400
> 
>     usb: xhci: remove option to change a default ring's TRB cycle bit
> 
>     [ Upstream commit e1b0fa863907a61e86acc19ce2d0633941907c8e ]
> 
>     The TRB cycle bit indicates TRB ownership by the Host Controller (HC) or
>     Host Controller Driver (HCD). New rings are initialized with
> 'cycle_state'
>     equal to one, and all its TRBs' cycle bits are set to zero. When
> handling
>     ring expansion, set the source ring cycle bits to the same value as the
>     destination ring.
> 
>     Move the cycle bit setting from xhci_segment_alloc() to
> xhci_link_rings(),
>     and remove the 'cycle_state' argument from xhci_initialize_ring_info().
>     The xhci_segment_alloc() function uses kzalloc_node() to allocate
> segments,
>     ensuring that all TRB cycle bits are initialized to zero.
> 
>     Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
>     Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
>     Link: https://lore.kernel.org/r/20241106101459.775897-12-mathias.nyman@linux.intel.com
>     Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>     Stable-dep-of: a5c98e8b1398 ("xhci: dbc: Fix full DbC transfer ring
> after several reconnects")
>     Signed-off-by: Sasha Levin <sashal@kernel.org>
>     Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> 
> 

Does 6.17 also have this problem?

thanks,

greg k-h