[PATCH 4.9 21/32] net: dsa: Do not suspend/resume closed slave_dev

Greg Kroah-Hartman
2018-08-04T09:05:43Z

From: Florian Fainelli <f.fainelli@gmail.com>

[ 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 <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>
---
net/dsa/slave.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1199,6 +1199,9 @@ int dsa_slave_suspend(struct net_device
{
struct dsa_slave_priv *p = netdev_priv(slave_dev);

+ if (!netif_running(slave_dev))
+ return 0;
+
netif_device_detach(slave_dev);

if (p->phy) {
@@ -1216,6 +1219,9 @@ int dsa_slave_resume(struct net_device *
{
struct dsa_slave_priv *p = netdev_priv(slave_dev);

+ if (!netif_running(slave_dev))
+ return 0;
+
netif_device_attach(slave_dev);

if (p->phy) {