From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Mon, 17 May 2021 10:32:15 +0000 (+0200)
Subject: 4.9-stable patches
X-Git-Tag: v5.4.120~36
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0151cddb985c3a172cf9223f5b00f00157f00c74;p=thirdparty%2Fkernel%2Fstable-queue.git

4.9-stable patches

added patches:
	thermal-core-fair-share-lock-the-thermal-zone-while-looping-over-instances.patch
---

diff --git a/queue-4.9/series b/queue-4.9/series
index 9d01d8a65b9..07c48c77d6a 100644
--- a/queue-4.9/series
+++ b/queue-4.9/series
@@ -216,3 +216,4 @@ fddi-defxx-make-mmio-the-configuration-default-except-for-eisa.patch
 mips-reinstate-platform-__div64_32-handler.patch
 mips-avoid-divu-in-__div64_32-is-result-would-be-zero.patch
 mips-avoid-handcoded-divu-in-__div64_32-altogether.patch
+thermal-core-fair-share-lock-the-thermal-zone-while-looping-over-instances.patch
diff --git a/queue-4.9/thermal-core-fair-share-lock-the-thermal-zone-while-looping-over-instances.patch b/queue-4.9/thermal-core-fair-share-lock-the-thermal-zone-while-looping-over-instances.patch
new file mode 100644
index 00000000000..793d2e07fdb
--- /dev/null
+++ b/queue-4.9/thermal-core-fair-share-lock-the-thermal-zone-while-looping-over-instances.patch
@@ -0,0 +1,42 @@
+From fef05776eb02238dcad8d5514e666a42572c3f32 Mon Sep 17 00:00:00 2001
+From: Lukasz Luba <lukasz.luba@arm.com>
+Date: Thu, 22 Apr 2021 16:36:22 +0100
+Subject: thermal/core/fair share: Lock the thermal zone while looping over instances
+
+From: Lukasz Luba <lukasz.luba@arm.com>
+
+commit fef05776eb02238dcad8d5514e666a42572c3f32 upstream.
+
+The tz->lock must be hold during the looping over the instances in that
+thermal zone. This lock was missing in the governor code since the
+beginning, so it's hard to point into a particular commit.
+
+CC: stable@vger.kernel.org # 4.4+
+Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
+Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
+Link: https://lore.kernel.org/r/20210422153624.6074-2-lukasz.luba@arm.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/thermal/fair_share.c |    4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/drivers/thermal/fair_share.c
++++ b/drivers/thermal/fair_share.c
+@@ -93,6 +93,8 @@ static int fair_share_throttle(struct th
+ 	int total_instance = 0;
+ 	int cur_trip_level = get_trip_level(tz);
+ 
++	mutex_lock(&tz->lock);
++
+ 	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
+ 		if (instance->trip != trip)
+ 			continue;
+@@ -121,6 +123,8 @@ static int fair_share_throttle(struct th
+ 		mutex_unlock(&instance->cdev->lock);
+ 		thermal_cdev_update(cdev);
+ 	}
++
++	mutex_unlock(&tz->lock);
+ 	return 0;
+ }
+