linux-kernel - Re: [PATCH 1/1] [net/irda]: Fix a misalign access issue.

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Date:	Mon, 12 May 2008 21:14:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Graf.Yang@...log.com
Cc:	marcel@...tmann.org, cooloney@...nel.org, samuel@...tiz.org,
	irda-users@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] [net/irda]: Fix a misalign access issue.

From: "Yang, Graf" <Graf.Yang@...log.com>
Date: Tue, 13 May 2008 12:07:35 +0800

> I have tried
> struct irda_device_info {
>         __u32       saddr;    /* Address of local interface */
>         __u32       daddr;    /* Address of remote device */
>         char        info[22]; /* Description */
>         __u8        charset;  /* Charset used for description */
>         __u8        reserve;  /* For align data */ 
>         __u8        hints[2]; /* Hint bits */
> };
> 
> It works with my irda driver. Can I modify it like this?

This header file and the irda_device_info datastructure are exported
to, and used by, userspace.

Therefore you cannot change this structure's layout without breaking
every single existing IRDA binary out there.
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