From: jsg <jsg@openbsd.org>
Date: Fri, 22 Jul 2022 06:19:59 +0000 (+0000)
Subject: drm/amd/pm: Prevent divide by zero
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=077e4f43f90cbed669df6eb6763e15ce63a34070;p=openbsd

drm/amd/pm: Prevent divide by zero

From Yefim Barashkin
8c37e7a2000d795aaad7256950f43c25f2aac67f in linux 5.15.y/5.15.56
0638c98c17aa12fe914459c82cd178247e21fb2b in mainline linux
---

diff --git a/sys/dev/pci/drm/amd/pm/swsmu/smu11/smu_v11_0.c b/sys/dev/pci/drm/amd/pm/swsmu/smu11/smu_v11_0.c
index 2aef862325a..244b413447d 100644
--- a/sys/dev/pci/drm/amd/pm/swsmu/smu11/smu_v11_0.c
+++ b/sys/dev/pci/drm/amd/pm/swsmu/smu11/smu_v11_0.c
@@ -1235,6 +1235,8 @@ int smu_v11_0_set_fan_speed_rpm(struct smu_context *smu,
 	uint32_t crystal_clock_freq = 2500;
 	uint32_t tach_period;
 
+	if (speed == 0)
+		return -EINVAL;
 	/*
 	 * To prevent from possible overheat, some ASICs may have requirement
 	 * for minimum fan speed: