net: dsa: Bring back device detaching in dsa_slave_suspend()

[ Upstream commit f154be241d22298d2b63c9b613f619fa1086ea75 ]

Commit 448b4482c671 ("net: dsa: Add lockdep class to tx queues to avoid
lockdep splat") removed the netif_device_detach() call done in
dsa_slave_suspend() which is necessary, and paired with a corresponding
netif_device_attach(), bring it back.

Fixes: 448b4482c671 ("net: dsa: Add lockdep class to tx queues to avoid lockdep splat")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 30e2e21d7619..3ff9d97cf56b 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1201,6 +1201,8 @@ int dsa_slave_suspend(struct net_device *slave_dev)
 {
         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 
+        netif_device_detach(slave_dev);
+
         if (p->phy) {
                 phy_stop(p->phy);
                 p->old_pause = -1;