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Message-ID: <CAPDyKFrdGEn8v3SCZueZGVoySRLX_qm3rHY6XAtTN5YgZ022GQ@mail.gmail.com>
Date: Fri, 22 Dec 2017 13:51:05 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Dong Aisheng <aisheng.dong@....com>
Cc: linux-clk <linux-clk@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-arm-kernel@...ts.infradead.org,
Stephen Boyd <sboyd@...eaurora.org>,
Mike Turquette <mturquette@...libre.com>,
Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [RFC PATCH V1 1/2] clk: use atomic runtime pm api in clk_core_is_enabled
On 22 December 2017 at 10:46, Dong Aisheng <aisheng.dong@....com> wrote:
> Current clk_pm_runtime_put is using pm_runtime_put_sync which
> is not safe to be called in clk_core_is_enabled as it should
> be able to run in atomic context.
>
> Thus use pm_runtime_put instead which is atomic safe.
>
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> Fixes: 9a34b45397e5 ("clk: Add support for runtime PM")
> Signed-off-by: Dong Aisheng <aisheng.dong@....com>
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
Kind regards
Uffe
> ---
> drivers/clk/clk.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 5ec5809..e24968f 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -227,7 +227,8 @@ static bool clk_core_is_enabled(struct clk_core *core)
>
> ret = core->ops->is_enabled(core->hw);
> done:
> - clk_pm_runtime_put(core);
> + if (core->dev)
> + pm_runtime_put(core->dev);
>
> return ret;
> }
> --
> 2.7.4
>
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