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caif: __dev_get_by_index instead of dev_get_by_index to find interface 

The following call chains indicate that chnl_net_open() is under
rtnl_lock protection as __dev_open() is protected by rtnl_lock.
So if __dev_get_by_index() instead of dev_get_by_index() is used
to find interface handler in it, this would help us avoid to change
interface reference counter.

__dev_open()
  chnl_net_open()

Cc: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
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 10:23:43 +08:00 committed by David S. Miller
parent 16b77695ed
commit a74e942694
1 changed files with 1 additions and 2 deletions
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3
net/caif/chnl_net.c
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@ -285,7 +285,7 @@ static int chnl_net_open(struct net_device *dev)
goto error;
}
lldev = dev_get_by_index(dev_net(dev), llifindex);
lldev = __dev_get_by_index(dev_net(dev), llifindex);
if (lldev == NULL) {
pr_debug("no interface?\n");
@ -307,7 +307,6 @@ static int chnl_net_open(struct net_device *dev)
mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
mtu = min_t(int, GPRS_PDP_MTU, mtu);
dev_set_mtu(dev, mtu);
dev_put(lldev);
if (mtu < 100) {
pr_warn("CAIF Interface MTU too small (%d)\n", mtu);