linux-kernel - Re: [PATCH] bt8xx: unaligned access

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Date:	Tue, 20 May 2008 17:38:43 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Al Viro <viro@....linux.org.uk>
Cc:	mchehab@...radead.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH] bt8xx: unaligned access

On Wed, 2008-05-21 at 01:32 +0100, Al Viro wrote:
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> ---
>  drivers/media/video/bt8xx/bttv-cards.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/video/bt8xx/bttv-cards.c b/drivers/media/video/bt8xx/bttv-cards.c
> index f20a01c..8ef0424 100644
> --- a/drivers/media/video/bt8xx/bttv-cards.c
> +++ b/drivers/media/video/bt8xx/bttv-cards.c
> @@ -34,6 +34,7 @@
>  #include <linux/firmware.h>
>  #include <net/checksum.h>
>  
> +#include <asm/unaligned.h>
>  #include <asm/io.h>
>  
>  #include "bttvp.h"
> @@ -3858,7 +3859,7 @@ static void __devinit osprey_eeprom(struct bttv *btv, const u8 ee[256])
>  		ee += i;
>  
>  		/* found a valid descriptor */
> -		type = be16_to_cpup((u16*)(ee+4));
> +		type = get_unaligned_be16((__be16 *)(ee+4));

The casts aren't strictly necessary here.  Any reason to keep it?

>  
>  		switch(type) {
>  		/* 848 based */
> @@ -3918,7 +3919,7 @@ static void __devinit osprey_eeprom(struct bttv *btv, const u8 ee[256])
>  			       btv->c.nr, type);
>  			break;
>  		}
> -		serial = be32_to_cpup((u32*)(ee+6));
> +		serial = get_unaligned_be32((__be32 *)(ee+6));

Ditto.

Cheers,

Harvey

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