linux-kernel - Re: [PATCH] misc/serio_raw: Avoid circular locking.

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Date:	Wed, 5 Oct 2011 22:07:26 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Thomas Tuttle <ttuttle@...omium.org>
Cc:	linux-kernel@...r.kernel.org, Johan Myreen <jem@....fi>
Subject: Re: [PATCH] misc/serio_raw: Avoid circular locking.

Hi Thomas,

On Wed, Oct 05, 2011 at 01:02:49PM -0400, Thomas Tuttle wrote:
> 
> This patch rearranges serio_raw_connect so that it takes the mutex once
> to allocate a device number and open the serio device, drops it to call
> misc_register, then takes it again to add the serio_raw device to the
> list.
> 
> BUG=chromium-os:21113
> TEST=Adhoc: PROVE_LOCKING no longer finds circular locking dependency
> 
> Change-Id: I414c5a3d606c28c81e42dcf989e5c55918eb4ea3
> Signed-off-by: Thomas Tuttle <ttuttle@...omium.org>
> ---
> I think this works, but I'm not familiar enough with the misc and serio
> subsystems to know if this is completely correct, nor if it is the best
> way to break the circular dependency.  Feedback would be appreciated.

Thank you for your report; I looked at the driver and (to my
embarrassment) is is quite broken and requires a bit more extensive
fixing. I'll be posting a few patches shortly and would appreciate if
you could look them over and/or test.

Thanks.

-- 
Dmitry
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