linux-kernel - Re: [PATCH v13 4/6] clk: Add rate constraints to clocks

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Date:	Mon, 2 Feb 2015 17:49:45 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Mike Turquette <mturquette@...aro.org>
Cc:	Tony Lindgren <tony@...mide.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Chao Xie <chao.xie@...vell.com>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Jonathan Corbet <corbet@....net>,
	Emilio L??pez <emilio@...pez.com.ar>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	Alex Elder <elder@...aro.org>,
	Zhangfei Gao <zhangfei.gao@...aro.org>,
	Bintian Wang <bintian.wang@...wei.com>,
	Matt Porter <mporter@...aro.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Tero Kristo <t-kristo@...com>,
	Manuel Lauss <manuel.lauss@...il.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Subject: Re: [PATCH v13 4/6] clk: Add rate constraints to clocks

On Mon, Feb 02, 2015 at 09:46:46AM -0800, Mike Turquette wrote:
> This looks like mis-matched enable/disable calls. We now have unique
> struct clk pointers for every call to clk_get. I haven't yet looked
> through the hwmod code but I have a feeling that we're doing something
> like this:
> 
> 	/* enable clock */
> 	my_clk = clk_get(...);
> 	clk_prepare_enable(my_clk);
> 	clk_put(my_clk);
> 
> 	/* do some work */
> 	do_work();
> 
> 	/* disable clock */
> 	my_clk = clk_get(...);
> 	clk_disable_unprepare(my_clk);
> 	clk_put(my_clk);
> 
> The above pattern no longer works since my_clk will be two different
> unique pointers, but it really should be one stable pointer across the
> whole usage of the clk. E.g:

Yes, it has always been documented that shall be the case.  Anyone doing
the above is basically broken.

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