Re: [PATCH] usb: gadget: f_uac2: fixed EP-IN wMaxPacketSize

[Greg KH <greg@kroah.com>]

On Fri, Sep 24, 2021 at 10:00:27AM +0200, Pavel Hofman wrote:
> Async feedback patches broke enumeration on Windows 10 previously fixed
> by commit 789ea77310f0 ("usb: gadget: f_uac2: always increase endpoint
> max_packet_size by one audio slot").
> 
> While the existing calculation for EP OUT capture for async mode yields
> size+1 frame due to uac2_opts->fb_max > 0, playback side lost the +1
> feature.  Therefore the +1 frame addition must be re-introduced for
> playback. Win10 enumerates the device only when both EP IN and EP OUT
> max packet sizes are (at least) +1 frame.
> 
> Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
> Tested-by: Henrik Enquist <henrik.enquist@gmail.com>
> Tested-by: Jack Pham <jackp@codeaurora.org>
> ---
>  drivers/usb/gadget/function/f_uac2.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)

What commit does this fix?

Should it go to stable kernel(s)?

thanks,

greg k-h