From a74e9426948cce451af0433c69a120178948cb03 Mon Sep 17 00:00:00 2001 From: Ying Xue Date: Wed, 15 Jan 2014 10:23:43 +0800 Subject: [PATCH] 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 Signed-off-by: Ying Xue Signed-off-by: David S. Miller --- net/caif/chnl_net.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/net/caif/chnl_net.c b/net/caif/chnl_net.c index 7344a8fa1bb0..4589ff67bfa9 100644 --- a/net/caif/chnl_net.c +++ b/net/caif/chnl_net.c @@ -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); -- 2.39.5