linux-kernel - Re: [REGRESSION][BISECTED] flood of "hid-generic ... control queue full" since v5.14-rc1

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Date:   Mon, 30 Aug 2021 17:48:09 +0200
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     Alan Stern <stern@...land.harvard.edu>,
        Michal Kubecek <mkubecek@...e.cz>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: Re: [REGRESSION][BISECTED] flood of "hid-generic ... control queue full" since v5.14-rc1

Hello.

On pondělí 16. srpna 2021 21:12:49 CEST Michal Kubecek wrote:
> On Mon, Aug 16, 2021 at 10:38:56AM -0400, Alan Stern wrote:
> > On Mon, Aug 16, 2021 at 04:13:47PM +0200, Michal Kubecek wrote:
> > > Looking at the code, the primary problem seems to be that the "else"
> > > branch in hid_submit_ctrl() recalculates transfer_buffer_length to
> > > a rounded up value but assigns the original length to wLength.
> > 
> > Looks like you found the bug.  Fixing it might be as simple as setting
> > len = padlen in that "else" branch.  You could then combine the
> > transfer_buffer_length assignment with the one in the "if" branch and
> > hoist them out after the entire "if" statement.
> 
> With the patch below, there are no errors and the UPS communication
> works correctly and so do other HID devices. But I would prefere someone
> familiar with HID code to confirm that this is what we want and what
> would be the right way to handle usb_submit_urb() errors.
> 
> Michal
> 
> diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
> index 06130dc431a0..ef240ef63a66 100644
> --- a/drivers/hid/usbhid/hid-core.c
> +++ b/drivers/hid/usbhid/hid-core.c
> @@ -377,27 +377,26 @@ static int hid_submit_ctrl(struct hid_device *hid)
>  	len = hid_report_len(report);
>  	if (dir == USB_DIR_OUT) {
>  		usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 
0);
> -		usbhid->urbctrl->transfer_buffer_length = len;
>  		if (raw_report) {
>  			memcpy(usbhid->ctrlbuf, raw_report, len);
>  			kfree(raw_report);
>  			usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
>  		}
>  	} else {
> -		int maxpacket, padlen;
> +		int maxpacket;
> 
>  		usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 
0);
>  		maxpacket = usb_maxpacket(hid_to_usb_dev(hid),
>  					  usbhid->urbctrl->pipe, 0);
>  		if (maxpacket > 0) {
> -			padlen = DIV_ROUND_UP(len, maxpacket);
> -			padlen *= maxpacket;
> -			if (padlen > usbhid->bufsize)
> -				padlen = usbhid->bufsize;
> +			len = DIV_ROUND_UP(len, maxpacket);
> +			len *= maxpacket;
> +			if (len > usbhid->bufsize)
> +				len = usbhid->bufsize;
>  		} else
> -			padlen = 0;
> -		usbhid->urbctrl->transfer_buffer_length = padlen;
> +			len = 0;
>  	}
> +	usbhid->urbctrl->transfer_buffer_length = len;
>  	usbhid->urbctrl->dev = hid_to_usb_dev(hid);
> 
>  	usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;

Any luck with moving this forward please? I've got a similar issue with APC 
UPS and v5.14 kernel, and this patch also solves the connectivity issue for 
me.

Thanks.

-- 
Oleksandr Natalenko (post-factum)