linux-kernel - Re: [RFC,PATCH 1/2] Add a common struct clk

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Message-ID: <20100614093459.GD12159@pengutronix.de>
Date:	Mon, 14 Jun 2010 11:34:59 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Lothar Waßmann <LW@...O-electronics.de>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Ben Dooks <ben-linux@...ff.org>
Subject: Re: [RFC,PATCH 1/2] Add a common struct clk

Hello,

> And arch/arm/plat-s3c/clock.c has the following comment:
> |/* We originally used an mutex here, but some contexts (see resume)
> | * are calling functions such as clk_set_parent() with IRQs disabled
> | * causing an BUG to be triggered.
> | */
> |DEFINE_SPINLOCK(clocks_lock);
I wonder why it's needed to reparent clocks during resume.  And where
exactly IRQs are disabled.  Hmm, this comment was initially introduced
by v2.6.28-rc7-180-gc3391e3, its commit log talks about cpufreq, not
resume.

Ben (Dooks): Is this still relevant?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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