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Message-Id: <20210208145806.712531651@linuxfoundation.org>
Date: Mon, 8 Feb 2021 16:00:59 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Stephen Berman <stephen.berman@....net>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 4.4 37/38] ACPI: thermal: Do not call acpi_thermal_check() directly
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
commit 81b704d3e4674e09781d331df73d76675d5ad8cb upstream.
Calling acpi_thermal_check() from acpi_thermal_notify() directly
is problematic if _TMP triggers Notify () on the thermal zone for
which it has been evaluated (which happens on some systems), because
it causes a new acpi_thermal_notify() invocation to be queued up
every time and if that takes place too often, an indefinite number of
pending work items may accumulate in kacpi_notify_wq over time.
Besides, it is not really useful to queue up a new invocation of
acpi_thermal_check() if one of them is pending already.
For these reasons, rework acpi_thermal_notify() to queue up a thermal
check instead of calling acpi_thermal_check() directly and only allow
one thermal check to be pending at a time. Moreover, only allow one
acpi_thermal_check_fn() instance at a time to run
thermal_zone_device_update() for one thermal zone and make it return
early if it sees other instances running for the same thermal zone.
While at it, fold acpi_thermal_check() into acpi_thermal_check_fn(),
as it is only called from there after the other changes made here.
[This issue appears to have been exposed by commit 6d25be5782e4
("sched/core, workqueues: Distangle worker accounting from rq
lock"), but it is unclear why it was not visible earlier.]
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=208877
Reported-by: Stephen Berman <stephen.berman@....net>
Diagnosed-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Tested-by: Stephen Berman <stephen.berman@....net>
Cc: All applicable <stable@...r.kernel.org>
[bigeasy: Backported to v4.4.y, use atomic_t instead of refcount_t]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/acpi/thermal.c | 54 ++++++++++++++++++++++++++++++++++---------------
1 file changed, 38 insertions(+), 16 deletions(-)
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -188,6 +188,8 @@ struct acpi_thermal {
int tz_enabled;
int kelvin_offset;
struct work_struct thermal_check_work;
+ struct mutex thermal_check_lock;
+ atomic_t thermal_check_count;
};
/* --------------------------------------------------------------------------
@@ -513,16 +515,6 @@ static int acpi_thermal_get_trip_points(
return 0;
}
-static void acpi_thermal_check(void *data)
-{
- struct acpi_thermal *tz = data;
-
- if (!tz->tz_enabled)
- return;
-
- thermal_zone_device_update(tz->thermal_zone);
-}
-
/* sys I/F for generic thermal sysfs support */
static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
@@ -556,6 +548,8 @@ static int thermal_get_mode(struct therm
return 0;
}
+static void acpi_thermal_check_fn(struct work_struct *work);
+
static int thermal_set_mode(struct thermal_zone_device *thermal,
enum thermal_device_mode mode)
{
@@ -581,7 +575,7 @@ static int thermal_set_mode(struct therm
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"%s kernel ACPI thermal control\n",
tz->tz_enabled ? "Enable" : "Disable"));
- acpi_thermal_check(tz);
+ acpi_thermal_check_fn(&tz->thermal_check_work);
}
return 0;
}
@@ -950,6 +944,12 @@ static void acpi_thermal_unregister_ther
Driver Interface
-------------------------------------------------------------------------- */
+static void acpi_queue_thermal_check(struct acpi_thermal *tz)
+{
+ if (!work_pending(&tz->thermal_check_work))
+ queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
+}
+
static void acpi_thermal_notify(struct acpi_device *device, u32 event)
{
struct acpi_thermal *tz = acpi_driver_data(device);
@@ -960,17 +960,17 @@ static void acpi_thermal_notify(struct a
switch (event) {
case ACPI_THERMAL_NOTIFY_TEMPERATURE:
- acpi_thermal_check(tz);
+ acpi_queue_thermal_check(tz);
break;
case ACPI_THERMAL_NOTIFY_THRESHOLDS:
acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
- acpi_thermal_check(tz);
+ acpi_queue_thermal_check(tz);
acpi_bus_generate_netlink_event(device->pnp.device_class,
dev_name(&device->dev), event, 0);
break;
case ACPI_THERMAL_NOTIFY_DEVICES:
acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
- acpi_thermal_check(tz);
+ acpi_queue_thermal_check(tz);
acpi_bus_generate_netlink_event(device->pnp.device_class,
dev_name(&device->dev), event, 0);
break;
@@ -1070,7 +1070,27 @@ static void acpi_thermal_check_fn(struct
{
struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
thermal_check_work);
- acpi_thermal_check(tz);
+
+ if (!tz->tz_enabled)
+ return;
+ /*
+ * In general, it is not sufficient to check the pending bit, because
+ * subsequent instances of this function may be queued after one of them
+ * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
+ * one of them is running, though, because it may have done the actual
+ * check some time ago, so allow at least one of them to block on the
+ * mutex while another one is running the update.
+ */
+ if (!atomic_add_unless(&tz->thermal_check_count, -1, 1))
+ return;
+
+ mutex_lock(&tz->thermal_check_lock);
+
+ thermal_zone_device_update(tz->thermal_zone);
+
+ atomic_inc(&tz->thermal_check_count);
+
+ mutex_unlock(&tz->thermal_check_lock);
}
static int acpi_thermal_add(struct acpi_device *device)
@@ -1102,6 +1122,8 @@ static int acpi_thermal_add(struct acpi_
if (result)
goto free_memory;
+ atomic_set(&tz->thermal_check_count, 3);
+ mutex_init(&tz->thermal_check_lock);
INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
@@ -1167,7 +1189,7 @@ static int acpi_thermal_resume(struct de
tz->state.active |= tz->trips.active[i].flags.enabled;
}
- queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
+ acpi_queue_thermal_check(tz);
return AE_OK;
}
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