netdev - [PATCH] wwan: core: Fix missing RTM_NEWLINK event for default link

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Message-Id: <1626978065-5239-1-git-send-email-loic.poulain@linaro.org>
Date:   Thu, 22 Jul 2021 20:21:05 +0200
From:   Loic Poulain <loic.poulain@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     johannes@...solutions.net, netdev@...r.kernel.org,
        ryazanov.s.a@...il.com, Loic Poulain <loic.poulain@...aro.org>,
        stable@...r.kernel.org
Subject: [PATCH] wwan: core: Fix missing RTM_NEWLINK event for default link

A wwan link created via the wwan_create_default_link procedure is
never notified to the user (RTM_NEWLINK), causing issues with user
tools relying on such event to track network links (NetworkManager).

This is because the procedure misses a call to rtnl_configure_link(),
which sets the link as initialized and notifies the new link (cf
proper usage in __rtnl_newlink()).

Cc: stable@...r.kernel.org
Fixes: ca374290aaad ("wwan: core: support default netdev creation")
Suggested-by: Sergey Ryazanov <ryazanov.s.a@...il.com>
Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
---
 drivers/net/wwan/wwan_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c
index 3e16c31..674a81d 100644
--- a/drivers/net/wwan/wwan_core.c
+++ b/drivers/net/wwan/wwan_core.c
@@ -984,6 +984,8 @@ static void wwan_create_default_link(struct wwan_device *wwandev,
 		goto unlock;
 	}
 
+	rtnl_configure_link(dev, NULL); /* Link initialized, notify new link */
+
 unlock:
 	rtnl_unlock();
 
-- 
2.7.4