netdev - Re: [PATCH] isdn capi driver broken on 64 bit.

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Message-ID: <20070827110226.GA15362@pingi.kke.suse.de>
Date:	Mon, 27 Aug 2007 13:02:26 +0200
From:	Karsten Keil <kkeil@...e.de>
To:	isdn4linux@...tserv.isdn4linux.de, netdev@...r.kernel.org
Subject: Re: [PATCH] isdn capi driver broken on 64 bit.

On Fri, Aug 24, 2007 at 11:08:11AM -0700, Stephen Hemminger wrote:
> The following driver API is broken on any architecture with 64 bit addresses.
> because of cast that loses high bits.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
> 
> 
> --- a/drivers/isdn/capi/capidrv.c	2007-06-25 09:03:12.000000000 -0700
> +++ b/drivers/isdn/capi/capidrv.c	2007-08-24 11:06:46.000000000 -0700
> @@ -1855,6 +1855,9 @@ static int if_sendbuf(int id, int channe
>  		return 0;
>  	}
>  	datahandle = nccip->datahandle;
> +
> +	/* This won't work on 64 bit! */
> +	BUILD_BUG_ON(sizeof(skb->data) > sizeof(u32));
>  	capi_fill_DATA_B3_REQ(&sendcmsg, global.ap.applid, card->msgid++,
>  			      nccip->ncci,	/* adr */
>  			      (u32) skb->data,	/* Data */

NACK.

It is not a BUG.

This is OK, since this field must have a value and on 32 it has the correct
one) On 64 bit this field is ignored (but also need a value, random data is
bad as well).

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