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

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Date:	Tue, 27 Dec 2011 19:47:06 +0100
From:	Rafał Miłecki <zajec5@...il.com>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
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

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?

-- 
Rafał
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