linux-kernel - Re: [PATCH] USB: g_printer: fix handling zero-length packet

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Date:	Sat, 20 Sep 2008 12:34:49 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	sangsu <sangsu@...il.com>
cc:	Greg KH <greg@...ah.com>, David Brownell <david-b@...bell.net>,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] USB: g_printer: fix handling zero-length packet

On Fri, 19 Sep 2008, sangsu wrote:

> g_printer doesn't have to check whether the data size is a multiple of
> MaxPacketSize, because device controller driver already make that check.
> 
> Signed-off-by: SangSu Park<sangsu@...il.com>
> ---
> drivers/usb/gadget/printer.c | 3++-
> 1 files changed, 2 insertion(+), 1 deletions(-)
> 
> 
> --- a/drivers/usb/gadget/printer.c	2008-08-12 21:55:39.000000000 -0400
> +++ b/drivers/usb/gadget/printer.c	2008-09-19 20:39:44.000000000 -0400
> @@ -1264,8 +1264,7 @@
> 	/* respond with data transfer before status phase? */
> 	if (value >= 0) {
> 		req->length = value;
> -		req->zero = value < wLength
> -				&& (value % gadget->ep0->maxpacket) == 0;
> +		req->zero = value < wLength;
> 		value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
> 		if (value < 0) {
> 			DBG(dev, "ep_queue --> %d\n", value);

When posting changes like this you should add Greg KH to the CC: list;  
otherwise he won't realize this patch needs to be merged.

You should also CC: the author of the original code -- but in this case
you can't because Craig Nadler didn't include his email address in the
source file.

For what it's worth, this patch looks okay to me.

Alan Stern

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