[PATCH 1/3] driver core: simply go out if the same device_link is added again

[Dong Aisheng]

It's possible that the same device link may be added by parsing the
function dependecy in DT. e.g. clock/gpio/regulators.
Simply go out for this case.

Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Saravana Kannan <saravanak@xxxxxxxxxx>
Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx>
---
 drivers/base/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 4c03bdd3a268..7d91d4074136 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -567,6 +567,9 @@ struct device_link *device_link_add(struct device *consumer,
 		if (link->consumer != consumer)
 			continue;
 
+		if (flags == link->flags)
+			goto out;
+
 		if (flags & DL_FLAG_PM_RUNTIME) {
 			if (!(link->flags & DL_FLAG_PM_RUNTIME)) {
 				pm_runtime_new_link(consumer);
-- 
2.23.0