linux-kernel - [PATCH v1 1/2] PM: hibernate: Restrict GFP mask in power

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Message-ID: <8625379.NyiUUSuA9g@rafael.j.wysocki>
Date: Fri, 26 Sep 2025 18:40:25 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v1 1/2] PM: hibernate: Restrict GFP mask in power_down()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Commit 12ffc3b1513e ("PM: Restrict swap use to later in the
suspend sequence") caused hibernation_platform_enter() to call
pm_restore_gfp_mask() via dpm_resume_end(), so when power_down()
returns after aborting hibernation_platform_enter(), it needs
to match the pm_restore_gfp_mask() call in hibernate() that will
occur subsequently.

Address this by adding a pm_restrict_gfp_mask() call to the relevant
error path in power_down().

Fixes: 12ffc3b1513e ("PM: Restrict swap use to later in the suspend sequence")
Cc: 6.16+ <stable@...r.kernel.org> # 6.16+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 kernel/power/hibernate.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -733,6 +733,8 @@ static void power_down(void)
 	case HIBERNATION_PLATFORM:
 		error = hibernation_platform_enter();
 		if (error == -EAGAIN || error == -EBUSY) {
+			/* Match pm_restore_gfp_mask() in hibernate(). */
+			pm_restrict_gfp_mask();
 			swsusp_unmark();
 			events_check_enabled = false;
 			pr_info("Wakeup event detected during hibernation, rolling back.\n");