Messages in this thread Patch in this message | | | From | Ying Xue <> | Subject | [PATCH net-next v2 04/10] dcb: use __dev_get_by_name instead of dev_get_by_name to find interface | Date | Wed, 15 Jan 2014 10:23:39 +0800 |
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The following call chain indicates that dcb_doit() is protected under rtnl_lock. So if we use __dev_get_by_name() instead of dev_get_by_name() to find interface handlers in it, this would help us avoid to change interface reference counter.
rtnetlink_rcv() rtnl_lock() netlink_rcv_skb() dcb_doit() rtnl_unlock()
Cc: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: Ying Xue <ying.xue@windriver.com> --- net/dcb/dcbnl.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-)
diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c index 66fbe19..5536444 100644 --- a/net/dcb/dcbnl.c +++ b/net/dcb/dcbnl.c @@ -1688,21 +1688,17 @@ static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh) if (!tb[DCB_ATTR_IFNAME]) return -EINVAL; - netdev = dev_get_by_name(net, nla_data(tb[DCB_ATTR_IFNAME])); + netdev = __dev_get_by_name(net, nla_data(tb[DCB_ATTR_IFNAME])); if (!netdev) return -ENODEV; - if (!netdev->dcbnl_ops) { - ret = -EOPNOTSUPP; - goto out; - } + if (!netdev->dcbnl_ops) + return -EOPNOTSUPP; reply_skb = dcbnl_newmsg(fn->type, dcb->cmd, portid, nlh->nlmsg_seq, nlh->nlmsg_flags, &reply_nlh); - if (!reply_skb) { - ret = -ENOBUFS; - goto out; - } + if (!reply_skb) + return -ENOBUFS; ret = fn->cb(netdev, nlh, nlh->nlmsg_seq, tb, reply_skb); if (ret < 0) { @@ -1714,7 +1710,6 @@ static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh) ret = rtnl_unicast(reply_skb, net, portid); out: - dev_put(netdev); return ret; } -- 1.7.9.5
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