b44: early return in dev->do_ioctl when the device is not up

The device has not gone through a whole reset/init sequence until the
device is up. Accessing the mii interface before this point is not
safe.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index c8d9b4d66704..e0ec777d96df 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -1838,12 +1838,15 @@ static int b44_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 {
         struct mii_ioctl_data *data = if_mii(ifr);
         struct b44 *bp = netdev_priv(dev);
-        int err;
+        int err = -EINVAL;
+
+        if (!netif_running(dev))
+                goto out;
 
         spin_lock_irq(&bp->lock);
         err = generic_mii_ioctl(&bp->mii_if, data, cmd, NULL);
         spin_unlock_irq(&bp->lock);
-
+out:
         return err;
 }