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From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 9 May 2015 23:03:47 +0200
Subject: [PATCH] pppoe: drop pppoe device in pppoe_unbind_sock_work
After receiving a PADT and the socket is closed, user space will no
longer drop the reference to the pppoe device.
This leads to errors like this:
[ 488.570000] unregister_netdevice: waiting for eth0.2 to become free. Usage count = 2
Fixes: 287f3a943fe ("pppoe: Use workqueue to die properly when a PADT is received")
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -462,6 +462,10 @@ static void pppoe_unbind_sock_work(struc
struct sock *sk = sk_pppox(po);
lock_sock(sk);
+ if (po->pppoe_dev) {
+ dev_put(po->pppoe_dev);
+ po->pppoe_dev = NULL;
+ }
pppox_unbind_sock(sk);
release_sock(sk);
sock_put(sk);
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