Subject: [PATCH 4/8] net: dsa: Do not suspend/resume closed slave_dev

From: Florian Fainelli <[email-masked]>
Date: Tue, 31 Jul 2018 17:12:52 -0700

[ Upstream commit a94c689e6c9e72e722f28339e12dff191ee5a265 ]

If a DSA slave network device was previously disabled, there is no need
to suspend or resume it.

Fixes: 2446254915a7 ("net: dsa: allow switch drivers to implement suspend/resume hooks")
Signed-off-by: Florian Fainelli <[email-masked]>
Reviewed-by: Andrew Lunn <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 net/dsa/slave.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 865e29e62bad..242e74b9d454 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1219,6 +1219,9 @@ int dsa_slave_suspend(struct net_device *slave_dev)
 {
 	struct dsa_slave_priv *p = netdev_priv(slave_dev);
 
+	if (!netif_running(slave_dev))
+		return 0;
+
 	netif_device_detach(slave_dev);
 
 	if (p->phy) {
@@ -1236,6 +1239,9 @@ int dsa_slave_resume(struct net_device *slave_dev)
 {
 	struct dsa_slave_priv *p = netdev_priv(slave_dev);
 
+	if (!netif_running(slave_dev))
+		return 0;
+
 	netif_device_attach(slave_dev);
 
 	if (p->phy) {
-- 
2.17.1