This is a note to let you know that I've just added the patch titled
PM: runtime: Fix ordering in pm_runtime_get_suppliers()
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pm-runtime-fix-ordering-in-pm_runtime_get_suppliers.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c0c33442f7203704aef345647e14c2fb86071001 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Date: Fri, 26 Mar 2021 12:56:18 +0200
Subject: PM: runtime: Fix ordering in pm_runtime_get_suppliers()
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
commit c0c33442f7203704aef345647e14c2fb86071001 upstream.
rpm_active indicates how many times the supplier usage_count has been
incremented. Consequently it must be updated after pm_runtime_get_sync() of
the supplier, not before.
Fixes: 4c06c4e6cf63 ("driver core: Fix possible supplier PM-usage counter imbalance")
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: 5.1+ <stable@xxxxxxxxxxxxxxx> # 5.1+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/power/runtime.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1690,8 +1690,8 @@ void pm_runtime_get_suppliers(struct dev
device_links_read_lock_held())
if (link->flags & DL_FLAG_PM_RUNTIME) {
link->supplier_preactivated = true;
- refcount_inc(&link->rpm_active);
pm_runtime_get_sync(link->supplier);
+ refcount_inc(&link->rpm_active);
}
device_links_read_unlock(idx);
Patches currently in stable-queue which might be from adrian.hunter@xxxxxxxxx are
queue-5.11/pm-runtime-fix-race-getting-putting-suppliers-at-probe.patch
queue-5.11/pm-runtime-fix-ordering-in-pm_runtime_get_suppliers.patch
