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Drivers: Staging: cxt1e1: use __dev_get_name instead of dev_get_name to find interfaces

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The following call chain denotes that both do_reset() and do_del_chan()
are protected under rtnl_lock. If we use __dev_get_by_name() instead of
dev_get_by_name() to find interface handlers in them, this would help
us avoid to change interface reference counter.

dev_ioctl()
  rtnl_lock()
  dev_ifsioc()
    c4_ioctl()
      do_reset()
      do_del_chan()
  rtnl_unlock()

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ying Xue 2014-01-15 10:23:36 +08:00 committed by David S. Miller
parent 85a5bac9cd
commit bdffbb8e26
1 changed files with 7 additions and 8 deletions
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15
drivers/staging/cxt1e1/linux.c
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@ -770,9 +770,9 @@ do_del_chan (struct net_device *musycc_dev, void *data)
if (cp.channum > 999)
return -EINVAL;
snprintf (buf, sizeof(buf), CHANNAME "%d", cp.channum);
if (!(dev = dev_get_by_name (&init_net, buf)))
return -ENOENT;
dev_put (dev);
dev = __dev_get_by_name(&init_net, buf);
if (!dev)
return -ENODEV;
ret = do_deluser (dev, 1);
if (ret)
return ret;
@ -792,19 +792,18 @@ do_reset (struct net_device *musycc_dev, void *data)
char buf[sizeof (CHANNAME) + 3];
sprintf (buf, CHANNAME "%d", i);
if (!(ndev = dev_get_by_name(&init_net, buf)))
continue;
ndev = __dev_get_by_name(&init_net, buf);
if (!ndev)
continue;
priv = dev_to_hdlc (ndev)->priv;
if ((unsigned long) (priv->ci) ==
(unsigned long) (netdev_priv(musycc_dev)))
{
ndev->flags &= ~IFF_UP;
dev_put (ndev);
netif_stop_queue (ndev);
do_deluser (ndev, 1);
} else
dev_put (ndev);
}
}
return 0;
}