Update Linux to v5.4.148
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.148.tar.gz
Change-Id: Ib3d26c5ba9b022e2e03533005c4fed4d7c30b61b
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index d831a61..383c702 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -174,6 +174,8 @@
int tz_enabled;
int kelvin_offset;
struct work_struct thermal_check_work;
+ struct mutex thermal_check_lock;
+ refcount_t thermal_check_count;
};
/* --------------------------------------------------------------------------
@@ -494,17 +496,6 @@
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,
- THERMAL_EVENT_UNSPECIFIED);
-}
-
/* sys I/F for generic thermal sysfs support */
static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
@@ -538,6 +529,8 @@
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)
{
@@ -563,7 +556,7 @@
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;
}
@@ -932,6 +925,12 @@
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);
@@ -942,17 +941,17 @@
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;
@@ -1052,7 +1051,27 @@
{
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 (!refcount_dec_not_one(&tz->thermal_check_count))
+ return;
+
+ mutex_lock(&tz->thermal_check_lock);
+
+ thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
+
+ refcount_inc(&tz->thermal_check_count);
+
+ mutex_unlock(&tz->thermal_check_lock);
}
static int acpi_thermal_add(struct acpi_device *device)
@@ -1084,6 +1103,8 @@
if (result)
goto free_memory;
+ refcount_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),
@@ -1149,7 +1170,7 @@
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;
}