linux-kernel - Re: [RFC 1/1] clk: Add notifier support in clk_prepare_enable/clk_disable

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Date:	Fri, 15 Mar 2013 16:59:47 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Bill Huang <bilhuang@...dia.com>,
	"mturquette@...aro.org" <mturquette@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"patches@...aro.org" <patches@...aro.org>
Subject: Re: [RFC 1/1] clk: Add notifier support in
	clk_prepare_enable/clk_disable_unprepare

On Tue, Mar 12, 2013 at 10:42:30PM -0600, Stephen Warren wrote:
> I believe the point Russell is making is not that the idea behind this
> patch is wrong, but simply that the function where you put the hooks is
> wrong. The hooks should at least be in clk_enable/clk_disable and not

Indeed, remembering that clk_enable/clk_disable can be called from
atomic contexts.

If the hook needs to be non-atomic (iow, it can schedule) then it can't
go into clk_enable/clk_disable, and must go into clk_prepare/clk_unprepare,
which is the schedulable half of that API.
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