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

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Message-ID: <47841296.8090104@gmail.com>
Date:	Tue, 08 Jan 2008 20:17:26 -0400
From:	Kevin Winchester <kjwinchester@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	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

Andi Kleen wrote:
> 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 ;-)
> 

Sorry about the noise here - I now notice that not all .ioctl function
pointers have the option of changing to .unlocked_ioctl.  In this case,
the ioctl is in the struct scsi_host_template, rather than struct
file_operations.

I'll try to be a little more careful about the git grepping in the future.

-- 
Kevin Winchester
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