mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-10 15:13:44 -04:00
Code Issues Packages Projects Releases Wiki Activity

cpufreq: Drop policy locking from cpufreq_policy_is_good_for_eas()

Browse Source 
Policy locking was added to cpufreq_policy_is_good_for_eas() by commit
4854649b1f ("cpufreq/sched: Move cpufreq-specific EAS checks to
cpufreq") to address a theoretical race condition, but it turned out to
introduce a circular locking dependency between the policy rwsem and
sched_domains_mutex via cpuset_mutex. This leads to a board lockup on
OdroidN2 that is based on the ARM64 Amlogic Meson SoC.

Drop the policy locking from cpufreq_policy_is_good_for_eas() to address
this issue.

Fixes: 4854649b1f ("cpufreq/sched: Move cpufreq-specific EAS checks to cpufreq")
Closes: https://lore.kernel.org/linux-pm/1bf3df62-0641-459f-99fc-fd511e564b84@samsung.com/
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/2806514.mvXUDI8C0e@rjwysocki.net
This commit is contained in:
Rafael J. Wysocki
2025-05-12 15:23:30 +02:00
parent 41abd479d1
commit f7e9228532
1 changed files with 0 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/cpufreq/cpufreq.c
View File

@@ -3067,8 +3067,6 @@ static bool cpufreq_policy_is_good_for_eas(unsigned int cpu)
return false;
}
guard(cpufreq_policy_read)(policy);
return sugov_is_governor(policy);
}