linux-kernel - [PATCH v2] PM: hibernate: Fix the bug where wake events cannot wake system during hibernation

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Date:   Mon, 20 Nov 2023 16:15:16 +0800
From:   Chris Feng <chris.feng@...iatek.com>
To:     <rafael@...nel.org>, <pavel@....cz>, <len.brown@...el.com>
CC:     <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <stable@...nel.org>, <hua.yang@...iatek.com>,
        <ting.wang@...iatek.com>, <liang.lu@...iatek.com>,
        <chetan.kumar@...iatek.com>, Chris Feng <chris.feng@...iatek.com>
Subject: [PATCH v2] PM: hibernate: Fix the bug where wake events cannot wake system during hibernation

Wake-up events that occur in the hibernation process's
hibernation_platform_enter() cannot wake up the system. Although the
current hibernation framework will execute part of the recovery process
after a wake-up event occurs, it ultimately performs a shutdown operation
because the system does not check the return value of
hibernation_platform_enter(). Moreover, when restoring the device before
system shutdown, the device's I/O and DMA capabilities will be turned on,
which can lead to data loss.

To solve this problem, check the return value of
hibernation_platform_enter(). When it returns -EAGAIN or -EBUSY, execute
the hibernation recovery process, discard the previously saved image, and
ultimately return to the working state.

Signed-off-by: Chris Feng <chris.feng@...iatek.com>
---
[PATCH v2]:
 - Execute the hibernation recovery process and return to the working state
   when the return value of the function hibernation_platform_enter() is
   -EAGAIN or -EBUSY. Both of the two values may indicate the occurrence of
   a wake-up event.
---
 kernel/power/hibernate.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 8d35b9f9aaa3..7e39a9baca9e 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -642,9 +642,9 @@ int hibernation_platform_enter(void)
  */
 static void power_down(void)
 {
-#ifdef CONFIG_SUSPEND
 	int error;
 
+#ifdef CONFIG_SUSPEND
 	if (hibernation_mode == HIBERNATION_SUSPEND) {
 		error = suspend_devices_and_enter(mem_sleep_current);
 		if (error) {
@@ -667,7 +667,13 @@ static void power_down(void)
 		kernel_restart(NULL);
 		break;
 	case HIBERNATION_PLATFORM:
-		hibernation_platform_enter();
+		error = hibernation_platform_enter();
+		if (error == -EAGAIN || error == -EBUSY) {
+			swsusp_unmark();
+			events_check_enabled = false;
+			pr_err("Hibernation Abort.\n");
+			return;
+		}
 		fallthrough;
 	case HIBERNATION_SHUTDOWN:
 		if (kernel_can_power_off())
-- 
2.17.0