linux-kernel - Re: [patch 1/1] Switch ioctl functions of drivers/scsi/sg.c to unlocked

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Date:	Thu, 10 Jan 2008 20:29:50 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Andre Noll <maan@...temlinux.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Richard Knutsson <ricknu-0@...dent.ltu.se>
Subject: Re: [patch 1/1] Switch ioctl functions of drivers/scsi/sg.c to unlocked_ioctl

On Thu, Jan 10, 2008 at 08:07:48PM +0100, Andre Noll wrote:
> On 19:59, Andi Kleen wrote:
> 
> > But perhaps for such a long ioctl handler it would be better to move
> > the lock/unlock_kernel()s into the individual case ...: statements;
> > then it could be eliminated step by step.
> 
> Sure, I can do that if James likes the idea. Since not all case
> statements need the BKL, we could add it only to those for which it
> isn't clear that it is unnecessary.
> 
> And this would actually improve something.

I still think it would be a good strategy to first add it to all
(in a essentially nop semantics patch) and then later eliminate
it from the cases that obviously don't need it. 

But yes eliminating it from all is the long term goal.

-Andi
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