diff mbox series

thermal: gov_user_space: Do not lock thermal zone mutex

Message ID 12067136.O9o76ZdvQC@kreacher
State New
Headers show
Series thermal: gov_user_space: Do not lock thermal zone mutex | expand

Commit Message

Rafael J. Wysocki Aug. 30, 2022, 6:15 p.m. UTC 
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Commit 670a5e356cb6 ("thermal/core: Move the thermal zone lock out of
the governors") moved thermal zone locking away from governors, but it
forgot about the user space one which deadlocks now.

Fix this by removing the thermal zone locking from the user space
governor.

Fixes: 670a5e356cb6 ("thermal/core: Move the thermal zone lock out of the governors")
Tested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

linux-next material

---
 drivers/thermal/gov_user_space.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

Index: linux-pm/drivers/thermal/gov_user_space.c
===================================================================
--- linux-pm.orig/drivers/thermal/gov_user_space.c
+++ linux-pm/drivers/thermal/gov_user_space.c
@@ -34,7 +34,8 @@  static int notify_user_space(struct ther
 	char *thermal_prop[5];
 	int i;
 
-	mutex_lock(&tz->lock);
+	lockdep_assert_held(&tz->lock);
+
 	thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type);
 	thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature);
 	thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d", trip);
@@ -43,7 +44,7 @@  static int notify_user_space(struct ther
 	kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop);
 	for (i = 0; i < 4; ++i)
 		kfree(thermal_prop[i]);
-	mutex_unlock(&tz->lock);
+
 	return 0;
 }