netdev - Re: [PATCH] ATM 32-bit ioctl compatibility

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Date:	Wed, 03 Dec 2008 22:12:54 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dwmw2@...radead.org
Cc:	linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: [PATCH] ATM 32-bit ioctl compatibility

From: David Woodhouse <dwmw2@...radead.org>
Date: Wed, 03 Dec 2008 16:00:31 +0000

> We lack compat ioctl support through most of the ATM code. This patch
> deals with most of it, and I can now at least use BR2684 and PPPoATM
> with 32-bit userspace.
> 
> I haven't added a .compat_ioctl method to struct atm_ioctl, because
> AFAICT none of the current users need any conversion -- so we can just
> call the ->ioctl() method in every case. I looked at br2684, clip, lec,
> mpc, pppoatm and atmtcp.
> 
> In svc_compat_ioctl() the only mangling which is needed is to change
> COMPAT_ATM_ADDPARTY to ATM_ADDPARTY. Although it's defined as
> 	_IOW('a', ATMIOC_SPECIAL+4,struct atm_iobuf)
> it doesn't actually _take_ a struct atm_iobuf as an argument -- it takes
> a struct sockaddr_atmsvc, which _is_ the same between 32-bit and 64-bit
> code, so doesn't need conversion.
> 
> Almost all of vcc_ioctl() would have been identical, so I converted that
> into a core do_vcc_ioctl() function with an 'int compat' argument.
> 
> I've done the same with atm_dev_ioctl(), where there _are_ a few
> differences, but still it's relatively contained and there would
> otherwise have been a lot of duplication.
> 
> I haven't done any of the actual device-specific ioctls, although I've
> added a compat_ioctl method to struct atmdev_ops.
> 
> Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>

Looks good David, applied to net-next-2.6, thanks!
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