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Date:   Wed, 28 Jul 2021 08:25:23 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Maxim Devaev <mdevaev@gmail.com>
Cc:     balbi@kernel.org, sandeen@redhat.com, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] usb: gadget: f_hid: idle uses the highest byte for
 duration
Message-ID: <YQD4U67wFqtXBGu1@kroah.com>
References: <20210727185800.43796-1-mdevaev@gmail.com>
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In-Reply-To: <20210727185800.43796-1-mdevaev@gmail.com>
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On Tue, Jul 27, 2021 at 09:58:00PM +0300, Maxim Devaev wrote:
> SET_IDLE value must be shifted 8 bits to the right to get duration.
> This confirmed by USBCV test.
> 
> Signed-off-by: Maxim Devaev <mdevaev@gmail.com>
> ---
>  drivers/usb/gadget/function/f_hid.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
> index 8d50c8b12..bb476e121 100644
> --- a/drivers/usb/gadget/function/f_hid.c
> +++ b/drivers/usb/gadget/function/f_hid.c
> @@ -573,7 +573,7 @@ static int hidg_setup(struct usb_function *f,
>  		  | HID_REQ_SET_IDLE):
>  		VDBG(cdev, "set_idle\n");
>  		length = 0;
> -		hidg->idle = value;
> +		hidg->idle = value >> 8;
>  		goto respond;
>  		break;
>  
> -- 
> 2.32.0
> 

You forgot to mention what commit this fixes up:

Fixes: afcff6dc690e ("usb: gadget: f_hid: added GET_IDLE and SET_IDLE handlers")

I've added it to the patch now, but try to remember it next time.

thanks,

greg k-h