Net: DSA: Fix checking for get_phy_flags function

The check for the presence or not of the optional switch function
get_phy_flags() called the function, rather than checked to see if it
is a NULL pointer. This causes a derefernce of a NULL pointer on all
switch chips except the sf2, the only switch to implement this call.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Fixes: 6819563e646a ("net: dsa: allow switch drivers to specify phy_device::dev_flags")
Cc: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index a851e9f14118..6d1817449c36 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -599,7 +599,7 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent,
         netif_carrier_off(slave_dev);
 
         if (p->phy != NULL) {
-                if (ds->drv->get_phy_flags(ds, port))
+                if (ds->drv->get_phy_flags)
                         p->phy->dev_flags |= ds->drv->get_phy_flags(ds, port);
 
                 phy_attach(slave_dev, dev_name(&p->phy->dev),