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Date: Fri, 1 Jul 2016 13:57:59 -0700
From: Eduardo Valentin <edubezval@...il.com>
To: Zhang Rui <rui.zhang@...el.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
"Lee, Chun-Yi" <jlee@...e.com>, Darren Hart <dvhart@...radead.org>,
Keerthy <j-keerthy@...com>, linux-kernel@...r.kernel.org,
linux-omap@...r.kernel.org, platform-driver-x86@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: [PATCHv4 1/1] thermal: core: call thermal_zone_device_update()
after mode update
On Wed, Jun 29, 2016 at 02:23:22PM +0800, Zhang Rui wrote:
> Hi, Eduardo,
>
> as the locking patch set has not been in upstream yet, you should
> either fold this fix into patch 02/15, or rebase your locking patch
> series on top of this fix.
I am folding into 02/15 and resending only the new version of that
patch. Are you OK to pick it up like that?
>
> thanks,
> rui
>
> On 三, 2016-06-22 at 08:03 -0700, Eduardo Valentin wrote:
> > Because several drivers do the following pattern:
> > .set_mode()
> > ...
> > local_data->mode = new_mode;
> > thermal_zone_device_update(tz);
> >
> > makes sense to simply do the thermal_zone_device_update()
> > in thermal core, after setting the new mode.
> >
> > Also, this patch also remove deadlocks on drivers that
> > call thermal_zone_device_update() on .set_mode(),
> > as .set_mode() is now called always with tz->lock held.
> >
> > Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> > Cc: Len Brown <lenb@...nel.org>
> > Cc: linux-acpi@...r.kernel.org
> > Cc: "Lee, Chun-Yi" <jlee@...e.com>
> > Cc: Darren Hart <dvhart@...radead.org>
> > Cc: Zhang Rui <rui.zhang@...el.com>
> > Cc: Keerthy <j-keerthy@...com>
> > Cc: linux-kernel@...r.kernel.org
> > Cc: linux-omap@...r.kernel.org
> > Cc: platform-driver-x86@...r.kernel.org
> > Cc: linux-pm@...r.kernel.org
> > Signed-off-by: Eduardo Valentin <edubezval@...il.com>
> > ---
> > Hello,
> >
> > V3->V4:
> > - ti-soc: Removed extra locking from TI SoC in set_mode
> > - ACPI: Kept the update on check as it is called on other places
> >
> > BR,
> >
> > Eduardo
> >
> > drivers/acpi/thermal.c | 1 -
> > drivers/platform/x86/acerhdf.c | 1 -
> > drivers/thermal/imx_thermal.c | 1 -
> > drivers/thermal/of-thermal.c | 5 -----
> > drivers/thermal/thermal_sysfs.c | 1 +
> > drivers/thermal/ti-soc-thermal/ti-thermal-common.c | 5 -----
> > 6 files changed, 1 insertion(+), 13 deletions(-)
> >
> > diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> > index 82707f9..03c3460 100644
> > --- a/drivers/acpi/thermal.c
> > +++ b/drivers/acpi/thermal.c
> > @@ -581,7 +581,6 @@ static int thermal_set_mode(struct
> > thermal_zone_device *thermal,
> > ACPI_DEBUG_PRINT((ACPI_DB_INFO,
> > "%s kernel ACPI thermal control\n",
> > tz->tz_enabled ? "Enable" : "Disable"));
> > - acpi_thermal_check(tz);
> > }
> > return 0;
> > }
> > diff --git a/drivers/platform/x86/acerhdf.c
> > b/drivers/platform/x86/acerhdf.c
> > index 460fa67..aee33ba 100644
> > --- a/drivers/platform/x86/acerhdf.c
> > +++ b/drivers/platform/x86/acerhdf.c
> > @@ -405,7 +405,6 @@ static inline void
> > acerhdf_enable_kernelmode(void)
> > kernelmode = 1;
> >
> > thz_dev->polling_delay = interval*1000;
> > - thermal_zone_device_update(thz_dev);
> > pr_notice("kernel mode fan control ON\n");
> > }
> >
> > diff --git a/drivers/thermal/imx_thermal.c
> > b/drivers/thermal/imx_thermal.c
> > index c5547bd..a413eb6 100644
> > --- a/drivers/thermal/imx_thermal.c
> > +++ b/drivers/thermal/imx_thermal.c
> > @@ -246,7 +246,6 @@ static int imx_set_mode(struct
> > thermal_zone_device *tz,
> > }
> >
> > data->mode = mode;
> > - thermal_zone_device_update(tz);
> >
> > return 0;
> > }
> > diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-
> > thermal.c
> > index b8e509c..95c47da 100644
> > --- a/drivers/thermal/of-thermal.c
> > +++ b/drivers/thermal/of-thermal.c
> > @@ -282,17 +282,12 @@ static int of_thermal_set_mode(struct
> > thermal_zone_device *tz,
> > {
> > struct __thermal_zone *data = tz->devdata;
> >
> > - mutex_lock(&tz->lock);
> > -
> > if (mode == THERMAL_DEVICE_ENABLED)
> > tz->polling_delay = data->polling_delay;
> > else
> > tz->polling_delay = 0;
> >
> > - mutex_unlock(&tz->lock);
> > -
> > data->mode = mode;
> > - thermal_zone_device_update(tz);
> >
> > return 0;
> > }
> > diff --git a/drivers/thermal/thermal_sysfs.c
> > b/drivers/thermal/thermal_sysfs.c
> > index 743df50..3d0dc30 100644
> > --- a/drivers/thermal/thermal_sysfs.c
> > +++ b/drivers/thermal/thermal_sysfs.c
> > @@ -100,6 +100,7 @@ mode_store(struct device *dev, struct
> > device_attribute *attr,
> > mutex_lock(&tz->lock);
> > result = tz->ops->set_mode(tz, mode);
> > mutex_unlock(&tz->lock);
> > + thermal_zone_device_update(tz);
> >
> > if (result)
> > return result;
> > diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> > b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> > index 15c0a9a..5dce053 100644
> > --- a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> > +++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> > @@ -193,19 +193,14 @@ static int ti_thermal_set_mode(struct
> > thermal_zone_device *thermal,
> > return 0;
> > }
> >
> > - mutex_lock(&data->ti_thermal->lock);
> > -
> > if (mode == THERMAL_DEVICE_ENABLED)
> > data->ti_thermal->polling_delay =
> > FAST_TEMP_MONITORING_RATE;
> > else
> > data->ti_thermal->polling_delay = 0;
> >
> > - mutex_unlock(&data->ti_thermal->lock);
> > -
> > data->mode = mode;
> > ti_bandgap_write_update_interval(bgp, data->sensor_id,
> > data->ti_thermal-
> > >polling_delay);
> > - thermal_zone_device_update(data->ti_thermal);
> > dev_dbg(&thermal->device, "thermal polling set for
> > duration=%d msec\n",
> > data->ti_thermal->polling_delay);
> >
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