linux-kernel - Re: [PATCH] video4linux: Push down the BKL

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Message-Id: <200805230828.49525.hverkuil@xs4all.nl>
Date:	Fri, 23 May 2008 08:28:49 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	video4linux-list@...hat.com
Cc:	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] video4linux: Push down the BKL

On Friday 23 May 2008 08:16:05 Hans Verkuil wrote:
> On Friday 23 May 2008 04:08:04 Andy Walls wrote:
> > On Thu, 2008-05-22 at 22:37 +0100, Alan Cox wrote:
> > > For most drivers the generic ioctl handler does the work and we
> > > update it and it becomes the unlocked_ioctl method. Older drivers
> > > use the usercopy method so we make it do the work. Finally there
> > > are a few special cases.
> > >
> > > Signed-off-by: Alan Cox <alan@...hat.com>
> >
> > I'd like to start planning out the changes to eliminate the BKL
> > from cx18.
> >
> > Could someone give me a brief education as to what elements of
> > cx18/ivtv_v4l2_do_ioctl() would be forcing the use of the BKL for
> > these drivers' ioctls?   I'm assuming it's not the
> > mutex_un/lock(&....->serialize_lock) and that the answer's not in
> > the diff.
>
> To the best of my knowledge there is no need for a BKL in ivtv or
> cx18. It was just laziness on my part that I hadn't switched to
> unlocked_ioctl yet. If you know of a reason why it should be kept for
> now, then I'd like to know, otherwise the BKL can be removed
> altogether for ivtv/cx18. I suspect you just pushed the lock down
> into the driver and in that case you can just remove it for
> ivtv/cx18.

Hmm, of course you just pushed down the lock, the subject said so. 
Sorry, it's early morning here and I'm apparently not yet fully 
awake :-)

Regards,

	Hans
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