linux-kernel - [PATCH] kselftest: cpufreq: Get rid of double suspend in rtcwake case

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Message-Id: <20250430-ksft-cpufreq-suspend-rtc-double-fix-v1-1-dc17a729c5a7@collabora.com>
Date: Wed, 30 Apr 2025 10:55:49 -0400
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Viresh Kumar <viresh.kumar@...aro.org>, Shuah Khan <shuah@...nel.org>, 
 Shreeya Patel <shreeya.patel@...labora.com>
Cc: kernel@...labora.com, Shuah Khan <skhan@...uxfoundation.org>, 
 linux-pm@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>
Subject: [PATCH] kselftest: cpufreq: Get rid of double suspend in rtcwake
 case

Commit 0b631ed3ce92 ("kselftest: cpufreq: Add RTC wakeup alarm") added
support for automatic wakeup in the suspend routine of the cpufreq
kselftest by using rtcwake, however it left the manual power state
change in the common path. The end result is that when running the
cpufreq kselftest with '-t suspend_rtc' or '-t hibernate_rtc', the
system will go to sleep and be woken up by the RTC, but then immediately
go to sleep again with no wakeup programmed, so it will sleep forever in
an automated testing setup.

Fix this by moving the manual power state change so that it only happens
when not using rtcwake.

Fixes: 0b631ed3ce92 ("kselftest: cpufreq: Add RTC wakeup alarm")
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
---
 tools/testing/selftests/cpufreq/cpufreq.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/cpufreq/cpufreq.sh b/tools/testing/selftests/cpufreq/cpufreq.sh
index e350c521b4675080943d2c74dc31533979410316..3aad9db921b5339585da5711a08775ebd965aaf3 100755
--- a/tools/testing/selftests/cpufreq/cpufreq.sh
+++ b/tools/testing/selftests/cpufreq/cpufreq.sh
@@ -244,9 +244,10 @@ do_suspend()
 					printf "Failed to suspend using RTC wake alarm\n"
 					return 1
 				fi
+			else
+				echo $filename > $SYSFS/power/state
 			fi

-			echo $filename > $SYSFS/power/state
 			printf "Came out of $1\n"

 			printf "Do basic tests after finishing $1 to verify cpufreq state\n\n"

---
base-commit: 8a2d53ce3c5f82683ad3df9a9a55822816fe64e7
change-id: 20250429-ksft-cpufreq-suspend-rtc-double-fix-75c560e1a30f

Best regards,
-- 
Nícolas F. R. A. Prado <nfraprado@...labora.com>