alias : Fix interface aliased on top of a static interface not getting active

An interfaces referring to a static interface is not getting active when doing a network
reload or ifup.
The problem is triggered by alias_set_device which is not clearing the pending update
(mostly a null device due to the previous down event) when the same device is set as the
current device via alias_notify_device.
As a result alias_set_device_state when called will overwrite the device with an invalid
pending device meaning the interface will not be set available anymore and thus will
stay down.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/alias.c b/alias.c
index 1f23da0..e4bb700 100644
--- a/alias.c
+++ b/alias.c
@@ -34,8 +34,15 @@ static const struct device_type alias_device_type;
 
 static void alias_set_device(struct alias_device *alias, struct device *dev)
 {
-	if (dev == alias->dep.dev)
+	if (dev == alias->dep.dev) {
+		if (alias->update) {
+			device_remove_user(&alias->new_dep);
+			alias->update = false;
+			if (dev)
+				device_set_present(&alias->dev, true);
+		}
 		return;
+	}
 
 	device_set_present(&alias->dev, false);
 	device_remove_user(&alias->new_dep);