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

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Date:	Wed, 28 Dec 2011 00:05:57 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Rafał Miłecki <zajec5@...il.com>
cc:	linux-wireless@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] b43: fix regression in PIO case

On Tue, 27 Dec 2011, Rafał Miłecki wrote:

> W dniu 26 grudnia 2011 18:28 użytkownik Guennadi Liakhovetski
> <g.liakhovetski@....de> napisał:
> > 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;
> > +       }
> > +       memset(rxhdr, 0, rxhdr_size);
> 
> Huuh, that's really tricky. Can you just do "normal" conditions as
> Larry suggested, please?

Sorry? I absolutely see nothing tricky there. Do you think this would look 
"less tricky" to you:

	switch (dev->fw.hdr_format) {
	case B43_FW_HDR_410:
	case B43_FW_HDR_351:
		rxhdr_size = offsetof(struct b43_rxhdr_fw4,
					format_351) +
			sizeof(rxhdr_size->format_351);
		break;
	case B43_FW_HDR_598:
		rxhdr_size = sizeof(*rxhdr);
		break;
	}

?

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