Re: [PATCH] usb: gadget: configfs: Correctly set use_os_string at bind

[Greg KH]

On Fri, Aug 22, 2025 at 11:36:09AM +0800, William Wu wrote:
> Once the use_os_string flag is set to true for some functions
> (e.g. adb/mtp) which need to response the OS string, and then
> if we re-bind the ConfigFS gadget to use the other functions
> (e.g. hid) which should not to response the OS string, however,
> because the use_os_string flag is still true, so the usb gadget
> response the OS string descriptor incorrectly, this can cause
> the USB device to be unrecognizable on the Windows system.
> 
> An example of this as follows:
> 
> echo 1 > os_desc/use
> ln -s functions/ffs.adb configs/b.1/function0
> start adbd
> echo "<udc device>" > UDC   #succeed
> 
> stop adbd
> rm configs/b.1/function0
> echo 0 > os_desc/use
> ln -s functions/hid.gs0 configs/b.1/function0
> echo "<udc device>" > UDC  #fail to connect on Windows
> 
> This patch sets the use_os_string flag to false at bind if
> the functions not support OS Descriptors.
> 
> Signed-off-by: William Wu <william.wu@xxxxxxxxxxxxxx>

What commit id does this fix?

thanks,

greg k-h