From: Stephen Boyd <sboyd@kernel.org>
To: Neil Armstrong <narmstrong@baylibre.com>,
jbrunet@baylibre.com, khilman@baylibre.com
Cc: Neil Armstrong <narmstrong@baylibre.com>,
martin.blumenstingl@googlemail.com, linux-kernel@vger.kernel.org,
linux-amlogic@lists.infradead.org, linux-clk@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC/RFT 05/14] soc: amlogic: meson-clk-measure: protect measure with a mutex
Date: Tue, 25 Jun 2019 13:27:01 -0700 [thread overview]
Message-ID: <20190625202702.B9A9B208CB@mail.kernel.org> (raw)
In-Reply-To: <20190620150013.13462-6-narmstrong@baylibre.com>
Quoting Neil Armstrong (2019-06-20 08:00:04)
> In order to protect clock measuring when multiple process asks for
> a mesure, protect the main measure function with mutexes.
>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
> drivers/soc/amlogic/meson-clk-measure.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/soc/amlogic/meson-clk-measure.c b/drivers/soc/amlogic/meson-clk-measure.c
> index 19d4cbc93a17..c470e24f1dfa 100644
> --- a/drivers/soc/amlogic/meson-clk-measure.c
> +++ b/drivers/soc/amlogic/meson-clk-measure.c
> @@ -11,6 +11,8 @@
> #include <linux/debugfs.h>
> #include <linux/regmap.h>
>
> +static DEFINE_MUTEX(measure_lock);
> +
> #define MSR_CLK_DUTY 0x0
> #define MSR_CLK_REG0 0x4
> #define MSR_CLK_REG1 0x8
> @@ -360,6 +362,10 @@ static int meson_measure_id(struct meson_msr_id *clk_msr_id,
> unsigned int val;
> int ret;
>
> + ret = mutex_lock_interruptible(&measure_lock);
Why interruptible?
> + if (ret)
> + return ret;
> +
> regmap_write(priv->regmap, MSR_CLK_REG0, 0);
>
> /* Set measurement duration */
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next prev parent reply other threads:[~2019-06-25 20:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-20 14:59 [RFC/RFT 00/14] arm64: g12a: add support for DVFS Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 01/14] pinctrl: meson-g12a: add pwm_a on GPIOE_2 pinmux Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 02/14] clk: core: introduce clk_hw_set_parent() Neil Armstrong
2019-06-25 20:32 ` Stephen Boyd
2019-06-26 8:22 ` Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 03/14] clk: meson: regmap: export regmap_div ops functions Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 04/14] clk: meson: eeclk: add setup callback Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 05/14] soc: amlogic: meson-clk-measure: protect measure with a mutex Neil Armstrong
2019-06-25 20:27 ` Stephen Boyd [this message]
2019-06-26 8:24 ` Neil Armstrong
2019-06-26 18:06 ` Stephen Boyd
2019-06-20 15:00 ` [RFC/RFT 06/14] soc: amlogic: meson-clk-measure: add G12B second cluster cpu clk Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 07/14] clk: meson: g12a: add notifiers to handle cpu clock change Neil Armstrong
2019-06-25 20:31 ` Stephen Boyd
2019-06-26 8:27 ` Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 08/14] clk: meson: g12a: expose CPUB clock ID for G12B Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 09/14] arm64: dts: move common G12A & G12B modes to meson-g12-common.dtsi Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 10/14] arm64: dts: meson-g12-common: add pwm_a on GPIOE_2 pinmux Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 11/14] arm64: dts: meson-g12a: add cpus OPP table Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 12/14] arm64: dts: meson-g12a: enable DVFS on G12A boards Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 13/14] arm64: dts: meson-g12b: add cpus OPP tables Neil Armstrong
2019-06-20 15:00 ` [RFC/RFT 14/14] arm64: dts: meson-g12b-odroid-n2: enable DVFS Neil Armstrong
2019-06-24 8:22 ` Neil Armstrong
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