diff mbox series

[1/2] PM: runtime: Fix ordering in pm_runtime_get_suppliers()

Message ID 20210326105619.27570-2-adrian.hunter@intel.com
State New
Headers show
Series PM: runtime: Fix race getting/putting suppliers at probe | expand

Commit Message

Adrian Hunter March 26, 2021, 10:56 a.m. UTC 
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@intel.com>
---
 drivers/base/power/runtime.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index d54e540067bf..4fde37713c58 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1690,8 +1690,8 @@  void pm_runtime_get_suppliers(struct device *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);