linux-kernel - Re: [JANITOR PROPOSAL] Switch ioctl functions to ->unlocked

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Date:	Wed, 9 Jan 2008 01:09:46 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Kevin Winchester <kjwinchester@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, paolo.ciarrocchi@...il.com,
	gorcunov@...il.com, jgarzik@...ox.com, linux-ide@...r.kernel.org
Subject: Re: [JANITOR PROPOSAL] Switch ioctl functions to ->unlocked_ioctl

On Tue, Jan 08, 2008 at 07:50:47PM -0400, Kevin Winchester wrote:
> Andi Kleen wrote:
> > Here's a proposal for some useful code transformations the kernel janitors
> > could do as opposed to running checkpatch.pl.
> > 
> <snip>
> 
> I notice that every driver in drivers/ata uses a .ioctl that points to
> ata_scsi_ioctl().  I could add the BKL to that function, and then change

This might be a little more complicated. These
are funnelled through the block/SCSI layers which might not have separate
unlocked ioctl callbacks yet. Would be probably not very difficult
to add though.

> all of the drivers to .unlocked_ioctl, but I assume this would be a
> candidate to actually clean up by determining why the lock is needed and
> removing it if necessary.  Does anyone know off-hand the reason for
> needing the lock (I assume someone does or it wouldn't have survived
> this long)?  If the lock is absolutely required, then I can write the
> patch to add lock_kernel() and unlock_kernel().

Just sending the patch to add lock/unlock_kernel() is probably a good idea anyways --
Jeff will then feel bad over it and eventually remove it when he figures out
it is safe ;-)

-Andi
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