From 61607003b1ef6e61aed18ade0f4d3bc75f1683fd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Duval?= <jerome.duval@gmail.com>
Date: Tue, 25 Jun 2024 17:58:53 +0200
Subject: [PATCH] kernel: check for NULL smallTaskCore in power_saving mode
 rebalance()

should fix power saving issue from #18915

Change-Id: Ie0d64445599a3f3af6b2c7f654b20e26bd4e3b8b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7790
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Haiku-Format: Haiku-format Bot <no-reply+haikuformatbot@haiku-os.org>
---
 src/system/kernel/scheduler/power_saving.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/system/kernel/scheduler/power_saving.cpp b/src/system/kernel/scheduler/power_saving.cpp
index 519cfe4b76..12ed609fac 100644
--- a/src/system/kernel/scheduler/power_saving.cpp
+++ b/src/system/kernel/scheduler/power_saving.cpp
@@ -150,8 +150,10 @@ rebalance(const ThreadData* threadData)
 			sSmallTaskCore = NULL;
 			CoreEntry* smallTaskCore = choose_small_task_core();
 
-			if (threadLoad > coreLoad / 3 || !smallTaskCore->CPUMask().Matches(mask))
+			if (threadLoad > coreLoad / 3 || smallTaskCore == NULL
+				|| !smallTaskCore->CPUMask().Matches(mask)) {
 				return core;
+			}
 			return coreLoad > kVeryHighLoad ? smallTaskCore : core;
 		}