[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 <gre...@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <raf...@kernel.org>
Cc: Saravana Kannan <sarava...@google.com>
Signed-off-by: Dong Aisheng <aisheng.d...@nxp.com>
---
 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