linux-kernel - Re: [PATCH 1/2] of: fix race when matching drivers

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Message-ID: <20110518195449.GA28653@suse.de>
Date:	Wed, 18 May 2011 12:54:49 -0700
From:	Greg KH <gregkh@...e.de>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Milton Miller <miltonm@....com>, sparclinux@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Josip Rodin <joy@...uzijast.net>
Subject: Re: [PATCH 1/2] of: fix race when matching drivers

On Wed, May 18, 2011 at 01:21:00PM -0600, Grant Likely wrote:
> From: Milton Miller <miltonm@....com>
> 
> If two drivers are probing devices at the same time, both will write
> their match table result to the dev->of_match cache at the same time.
> 
> Only write the result if the device matches.
> 
> In a thread titled "SBus devices sometimes detected, sometimes not",
> Meelis reported his SBus hme was not detected about 50% of the time.
> >From the debug suggested by Grant it was obvious another driver matched
> some devices between the call to match the hme and the hme discovery
> failling.
> 
> Reported-by: Meelis Roos <mroos@...ux.ee>
> Signed-off-by: Milton Miller <miltonm@....com>
> [grant.likely: modified to only call of_match_device() once]
> Signed-off-by: Grant Likely <grant.likely@...retlab.ca>

Acked-by: Greg Kroah-Hartman <gregkh@...e.de>

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