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Date: Mon, 6 Jun 2016 14:19:12 +0800
From: hl <hl@...k-chips.com>
To: Thierry Reding <thierry.reding@...il.com>
Cc: heiko@...ech.de, mark.yao@...k-chips.com, myungjoo.ham@...sung.com,
mturquette@...libre.com, sboyd@...eaurora.org,
linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org, airlied@...ux.ie,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
kyungmin.park@...sung.com, dianders@...omium.org,
dbasehore@...omium.org, huangtao@...k-chips.com, typ@...k-chips.com
Subject: Re: [RFC PATCH v1 4/6] PM / devfreq: event: support rockchip dfi
controller
Hi Thierry,
On 2016年06月04日 00:54, Thierry Reding wrote:
> On Fri, Jun 03, 2016 at 05:55:17PM +0800, Lin Huang wrote:
> [...]
>> + ret = clk_prepare_enable(data->clk);
>> + if (ret) {
>> + dev_err(&pdev->dev, "failed to enable clk: %d\n", ret);
>> + clk_disable_unprepare(data->clk);
>> + return ret;
>> + }
> This is going to give you a large WARN. clk_prepare_enable() already
> leaves the clock in a proper state when it fails (i.e. it calls
> clk_unprepare() if the clk_enable() part failed), so calling
> clk_disable_unprepare() upon failure is going to unbalance the
> reference counts.
Thanks for reminding, i will fix it next version.
>
> Thierry
--
Lin Huang
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