linux-kernel - [PATCH v2] PM: suspend: Make pm_test delay interruptible by wakeup events

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Message-Id: <20251106011909.2189279-1-luriwen@kylinos.cn>
Date: Thu,  6 Nov 2025 09:19:09 +0800
From: Riwen Lu <luriwen@...inos.cn>
To: rafael@...nel.org,
	pavel@...nel.org,
	lenb@...nel.org
Cc: linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Riwen Lu <luriwen@...inos.cn>,
	xiongxin <xiongxin@...inos.cn>
Subject: [PATCH v2] PM: suspend: Make pm_test delay interruptible by wakeup events

Modify the suspend_test() function to make the test delay can be
interrupted by wakeup events.

This improves the responsiveness of the system during suspend testing
when wakeup events occur, allowing the suspend process to proceed
without waiting for the full test delay to complete when wakeup events
are detected.

Additionally, using msleep() instead of mdelay() avoids potential soft
lockup "CPU stuck" issues when long test delays are configured.

Signed-off-by: Riwen Lu <luriwen@...inos.cn>
Signed-off-by: xiongxin <xiongxin@...inos.cn>
---
 kernel/power/suspend.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 4bb4686c1c08..a8e80ba8ac2c 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -344,10 +344,14 @@ MODULE_PARM_DESC(pm_test_delay,
 static int suspend_test(int level)
 {
 #ifdef CONFIG_PM_DEBUG
+	int i;
+
 	if (pm_test_level == level) {
 		pr_info("suspend debug: Waiting for %d second(s).\n",
 				pm_test_delay);
-		mdelay(pm_test_delay * 1000);
+		for (i = 0; i < pm_test_delay && !pm_wakeup_pending(); i++)
+			msleep(1000);
+
 		return 1;
 	}
 #endif /* !CONFIG_PM_DEBUG */
-- 
2.25.1