diff options
| author |   Ying Xue <ying.xue@windriver.com> | 2014-01-15 10:23:36 +0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-01-14 18:50:46 -0800 |
| commit | bdffbb8e2630feb258d848cdfabaebbdb8105864 (patch) | |
| tree | 04e84d9e9ac528eddcc3292ea9d99fa9cec3f79f | |
| parent | Merge branch 'r8152' (diff) | |
| download | linux-dev-bdffbb8e2630feb258d848cdfabaebbdb8105864.tar.xz linux-dev-bdffbb8e2630feb258d848cdfabaebbdb8105864.zip | |
Drivers: Staging: cxt1e1: use __dev_get_name instead of dev_get_name to find interfaces
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>
| -rw-r--r-- | drivers/staging/cxt1e1/linux.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/staging/cxt1e1/linux.c b/drivers/staging/cxt1e1/linux.c index 9b483739881a..4a08e16e42f7 100644 --- a/drivers/staging/cxt1e1/linux.c +++ b/drivers/staging/cxt1e1/linux.c @@ -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; } |