linux-kernel - Re: [PATCH v2] OF: base: match each node compatible against all given matches first

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Message-ID: <alpine.SOC.1.00.1312041506010.8902@math.ut.ee>
Date:	Wed, 4 Dec 2013 15:08:39 +0200 (EET)
From:	Meelis Roos <mroos@...ux.ee>
To:	Thierry Reding <thierry.reding@...il.com>
cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Russell King <linux@....linux.org.uk>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Scott Wood <scottwood@...escale.com>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH v2] OF: base: match each node compatible against all
 given matches first

> I added Meelis on Cc because he found a regression with my original
> proposal (107a84e61cdd "of: match by compatible property first"). That
> got later reverted in commit bc51b0c22ceb (Revert "of: match by
> compatible property first"). Here's the commit message for reference:
> 
> commit bc51b0c22ceb
> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> Date:   Tue Jul 10 12:49:32 2012 -0700
> 
>     Revert "of: match by compatible property first"
> 
>     This reverts commit 107a84e61cdd3406c842a0e4be7efffd3a05dba6.
> 
>     Meelis Roos reports a regression since 3.5-rc5 that stops Sun Fire V100
>     and Sun Netra X1 sparc64 machines from booting, hanging after enabling
>     serial console.  He bisected it to commit 107a84e61cdd.
> 
>     Rob Herring explains:
>      "The problem is match combinations of compatible plus name and/or type
>       fail to match correctly.  I have a fix for this, but given how late it
>       is for 3.5 I think it is best to revert this for now.  There could be
>       other cases that rely on the current although wrong behavior.  I will
>       post an updated version for 3.6."
> 
>     Bisected-and-reported-by: Meelis Roos <mroos@...ux.ee>
>     Requested-by: Rob Herring <rob.herring@...xeda.com>
>     Cc: Thierry Reding <thierry.reding@...onic-design.de>
>     Cc: Grant Likely <grant.likely@...retlab.ca>
>     Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> 
> So if Meelis still has access to the Sun Fire V100 and Sun Netra X1
> machines that regressed last time around, it'd be great to get this
> patch tested on them to verify that it indeed fixes the problem and
> doesn't regress.

OK, I had forgotten about that.

Tested successfully on the same Sun Fire V100 and Sun Netra X1, on top 
of 3.13-rc2. The sunsu console is detected fine and I see no problem for 
now.

-- 
Meelis Roos (mroos@...ux.ee)
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