linux-kernel - Re: [PATCH] b43: fix regression in PIO case

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Date:	Mon, 26 Dec 2011 19:17:02 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Larry Finger <Larry.Finger@...inger.net>
cc:	Rafał Miłecki <zajec5@...il.com>,
	linux-wireless@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	b43-dev <b43-dev@...ts.infradead.org>
Subject: Re: [PATCH] b43: fix regression in PIO case

On Mon, 26 Dec 2011, Larry Finger wrote:

> On 12/26/2011 11:28 AM, Guennadi Liakhovetski wrote:
> > This patch fixes the regression, introduced by
> > 
> > commit 17030f48e31adde5b043741c91ba143f5f7db0fd
> > From: Rafał Miłecki<zajec5@...il.com>
> > Date: Thu, 11 Aug 2011 17:16:27 +0200
> > Subject: [PATCH] b43: support new RX header, noticed to be used in 598.314+
> > fw
> > 
> > in PIO case.
> > 
> > Signed-off-by: Guennadi Liakhovetski<g.liakhovetski@....de>
> > ---
> > diff --git a/drivers/net/wireless/b43/pio.c b/drivers/net/wireless/b43/pio.c
> > index ce8a4bd..b64b64c 100644
> > --- a/drivers/net/wireless/b43/pio.c
> > +++ b/drivers/net/wireless/b43/pio.c
> > @@ -617,9 +617,19 @@ static bool pio_rx_frame(struct b43_pio_rxqueue *q)
> >   	const char *err_msg = NULL;
> >   	struct b43_rxhdr_fw4 *rxhdr =
> >   		(struct b43_rxhdr_fw4 *)wl->pio_scratchspace;
> > +	size_t rxhdr_size = sizeof(*rxhdr);
> > 
> >   	BUILD_BUG_ON(sizeof(wl->pio_scratchspace)<  sizeof(*rxhdr));
> > -	memset(rxhdr, 0, sizeof(*rxhdr));
> > +	switch (dev->fw.hdr_format) {
> > +	case B43_FW_HDR_410:
> > +	case B43_FW_HDR_351:
> > +		rxhdr_size -= sizeof(rxhdr->format_598) -
> > +			sizeof(rxhdr->format_351);
> > +		break;
> > +	case B43_FW_HDR_598:
> > +		break;
> > +	}
> 
> I do not think the above will work for format_410. By my count, the format_410
> struct is 4 bytes longer than the format_351 struct.

I think you're looking at struct b43_txhdr, whereas the problem is in 
struct b43_rxhdr_fw4.

Thanks
Guennadi

> 
> Even if it does work, I suggest using the following:
> 
> 	size_t rxhdr_size;
> 
>    	BUILD_BUG_ON(sizeof(wl->pio_scratchspace)<  sizeof(*rxhdr));
> 	switch (dev->fw.hdr_format) {
> 	case B43_FW_HDR_351:
> 		rxhdr_size = sizeof(rxhdr->format_351);
> 		break;
> 	case B43_FW_HDR_410:
> etc.
> 
> 
> Larry
> 

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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