linux-kernel - Re: [PATCH] snapshot: Push BKL down into ioctl handlers

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Date:	Fri, 23 May 2008 13:22:32 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org,
	Pavel Machek <pavel@....cz>
Subject: Re: [PATCH] snapshot: Push BKL down into ioctl handlers

On Friday, 23 of May 2008, Alan Cox wrote:
> > >  
> > > +	lock_kernel();
> > > +
> > 
> > Hm, well, I admit I'm a bit ignorant as far as the chardev locking is
> > concerned, but can you please tell me why would that be wrong if we didn't call
> > lock_kernel() here at all?
> 
> I've just been pushing the lock down. If the code already has enough
> internal locking for things like multiple ioctls in parallel then you can
> probably kill it entirely - but that needs someone who knows that driver
> well to decide and evaluate.

Thanks, I'll have a look.

ACK for the patch from me.

Thanks,
Rafael
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