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Date: Wed, 15 Apr 2020 00:14:50 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
linux-pm@...r.kernel.org
Cc: Zhang Rui <rui.zhang@...el.com>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Len Brown <lenb@...nel.org>, Jiri Pirko <jiri@...lanox.com>,
Ido Schimmel <idosch@...lanox.com>,
"David S . Miller" <davem@...emloft.net>,
Peter Kaestle <peter@...e.net>,
Darren Hart <dvhart@...radead.org>,
Andy Shevchenko <andy@...radead.org>,
Support Opensource <support.opensource@...semi.com>,
Amit Kucheria <amit.kucheria@...durent.com>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Allison Randal <allison@...utok.net>,
Enrico Weigelt <info@...ux.net>,
Gayatri Kammela <gayatri.kammela@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
linux-acpi@...r.kernel.org, netdev@...r.kernel.org,
platform-driver-x86@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [RFC v2 3/9] thermal: Properly handle mode values in .set_mode()
Hi Andrzej,
you can drop this patch. It is not useful as the caller checks the
correctness of the values in the patch 4/9.
Moreover the patch is bogus because it returns before releasing the lock.
On 14/04/2020 20:00, Andrzej Pietrasiewicz wrote:
> Allow only THERMAL_DEVICE_ENABLED and THERMAL_DEVICE_DISABLED as valid
> states to transition to.
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@...labora.com>
> ---
> drivers/net/ethernet/mellanox/mlxsw/core_thermal.c | 8 ++++++--
> drivers/platform/x86/acerhdf.c | 4 ++++
> drivers/thermal/imx_thermal.c | 4 +++-
> drivers/thermal/intel/intel_quark_dts_thermal.c | 5 ++++-
> drivers/thermal/of-thermal.c | 4 +++-
> 5 files changed, 20 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> index ce0a6837daa3..cd435ca7adbe 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> @@ -296,8 +296,10 @@ static int mlxsw_thermal_set_mode(struct thermal_zone_device *tzdev,
>
> if (mode == THERMAL_DEVICE_ENABLED)
> tzdev->polling_delay = thermal->polling_delay;
> - else
> + else if (mode == THERMAL_DEVICE_DISABLED)
> tzdev->polling_delay = 0;
> + else
> + return -EINVAL;
>
> mutex_unlock(&tzdev->lock);
>
> @@ -486,8 +488,10 @@ static int mlxsw_thermal_module_mode_set(struct thermal_zone_device *tzdev,
>
> if (mode == THERMAL_DEVICE_ENABLED)
> tzdev->polling_delay = thermal->polling_delay;
> - else
> + else if (mode == THERMAL_DEVICE_DISABLED)
> tzdev->polling_delay = 0;
> + else
> + return -EINVAL;
>
> mutex_unlock(&tzdev->lock);
>
> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
> index 8cc86f4e3ac1..d5188c1d688b 100644
> --- a/drivers/platform/x86/acerhdf.c
> +++ b/drivers/platform/x86/acerhdf.c
> @@ -431,6 +431,10 @@ static int acerhdf_get_mode(struct thermal_zone_device *thermal,
> static int acerhdf_set_mode(struct thermal_zone_device *thermal,
> enum thermal_device_mode mode)
> {
> + if (mode != THERMAL_DEVICE_DISABLED &&
> + mode != THERMAL_DEVICE_ENABLED)
> + return -EINVAL;
> +
> if (mode == THERMAL_DEVICE_DISABLED && kernelmode)
> acerhdf_revert_to_bios_mode();
> else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode)
> diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
> index e761c9b42217..36b1924f1938 100644
> --- a/drivers/thermal/imx_thermal.c
> +++ b/drivers/thermal/imx_thermal.c
> @@ -361,7 +361,7 @@ static int imx_set_mode(struct thermal_zone_device *tz,
> data->irq_enabled = true;
> enable_irq(data->irq);
> }
> - } else {
> + } else if (mode == THERMAL_DEVICE_DISABLED) {
> regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
> soc_data->measure_temp_mask);
> regmap_write(map, soc_data->sensor_ctrl + REG_SET,
> @@ -374,6 +374,8 @@ static int imx_set_mode(struct thermal_zone_device *tz,
> disable_irq(data->irq);
> data->irq_enabled = false;
> }
> + } else {
> + return -EINVAL;
> }
>
> data->mode = mode;
> diff --git a/drivers/thermal/intel/intel_quark_dts_thermal.c b/drivers/thermal/intel/intel_quark_dts_thermal.c
> index d704fc104cfd..11d7db895125 100644
> --- a/drivers/thermal/intel/intel_quark_dts_thermal.c
> +++ b/drivers/thermal/intel/intel_quark_dts_thermal.c
> @@ -325,8 +325,11 @@ static int sys_set_mode(struct thermal_zone_device *tzd,
> mutex_lock(&dts_update_mutex);
> if (mode == THERMAL_DEVICE_ENABLED)
> ret = soc_dts_enable(tzd);
> - else
> + else if (mode == THERMAL_DEVICE_DISABLED)
> ret = soc_dts_disable(tzd);
> + else
> + return -EINVAL;
> +
> mutex_unlock(&dts_update_mutex);
>
> return ret;
> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> index 874a47d6923f..36bebf623980 100644
> --- a/drivers/thermal/of-thermal.c
> +++ b/drivers/thermal/of-thermal.c
> @@ -289,9 +289,11 @@ static int of_thermal_set_mode(struct thermal_zone_device *tz,
> if (mode == THERMAL_DEVICE_ENABLED) {
> tz->polling_delay = data->polling_delay;
> tz->passive_delay = data->passive_delay;
> - } else {
> + } else if (mode == THERMAL_DEVICE_DISABLED) {
> tz->polling_delay = 0;
> tz->passive_delay = 0;
> + } else {
> + return -EINVAL;
> }
>
> mutex_unlock(&tz->lock);
>
--
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