[PATCH 6.18 119/314] PM: sleep: core: Avoid bit field races related to work_in_progress

Sasha Levin
2026-03-10T11:26:34Z

From: Xuewen Yan <xuewen.yan@unisoc.com>

[ Upstream commit 0491f3f9f664e7e0131eb4d2a8b19c49562e5c64 ]

In all of the system suspend transition phases, the async processing of
a device may be carried out in parallel with power.work_in_progress
updates for the device's parent or suppliers and if it touches bit
fields from the same group (for example, power.must_resume or
power.wakeup_path), bit field corruption is possible.

To avoid that, turn work_in_progress in struct dev_pm_info into a proper
bool field and relocate it to save space.

Fixes: aa7a9275ab81 ("PM: sleep: Suspend async parents after suspending children")
Fixes: 443046d1ad66 ("PM: sleep: Make suspend of devices more asynchronous")
Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
Closes: https://lore.kernel.org/linux-pm/20260203063459.12808-1-xuewen.yan@unisoc.com/
Cc: All applicable <stable@vger.kernel.org>
[ rjw: Added subject and changelog ]
Link: https://patch.msgid.link/CAB8ipk_VX2VPm706Jwa1=8NSA7_btWL2ieXmBgHr2JcULEP76g@mail.gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/linux/pm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/pm.h b/include/linux/pm.h
index cc7b2dc28574c..12782f775a17e 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -677,10 +677,10 @@ struct dev_pm_info {
struct list_head entry;
struct completion completion;
struct wakeup_source *wakeup;
+ bool work_in_progress; /* Owned by the PM core */
bool wakeup_path:1;
bool syscore:1;
bool no_pm_callbacks:1; /* Owned by the PM core */
- bool work_in_progress:1; /* Owned by the PM core */
bool smart_suspend:1; /* Owned by the PM core */
bool must_resume:1; /* Owned by the PM core */
bool may_skip_resume:1; /* Set by subsystems */
--
2.51.0