Commit 0917b933 authored Jan 15, 2014 by Ying Xue Committed by David S. Miller Jan 14, 2014

bonding: use __dev_get_by_name instead of dev_get_by_name to find interface



The following call chain indicates that bond_do_ioctl() is protected
under rtnl_lock. If we use __dev_get_by_name() instead of
dev_get_by_name() to find interface handler in it, this would
help us avoid to change reference counter of interface once.

dev_ioctl()
  rtnl_lock()
  dev_ifsioc()
    bond_do_ioctl()
  rtnl_unlock()

Additionally we also change the coding style in bond_do_ioctl(),
letting it more readable for us.

Cc: Jay Vosburgh <fubar@us.ibm.com>
Cc: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Acked-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent bdffbb8e

drivers/net/bonding/bond_main.c

+23 −26

Original line number	Diff line number	Diff line
		@@ -3213,13 +3213,13 @@ static int bond_do_ioctl(struct net_device bond_dev, struct ifreq ifr, int cmd
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
		return -EPERM;

		slave_dev = dev_get_by_name(net, ifr->ifr_slave);
		slave_dev = __dev_get_by_name(net, ifr->ifr_slave);

		pr_debug("slave_dev=%p:\n", slave_dev);

		if (!slave_dev)
		res = -ENODEV;
		else {
		return -ENODEV;

		pr_debug("slave_dev->name=%s:\n", slave_dev->name);
		switch (cmd) {
		case BOND_ENSLAVE_OLD:
		@@ -3243,9 +3243,6 @@ static int bond_do_ioctl(struct net_device bond_dev, struct ifreq ifr, int cmd
		res = -EOPNOTSUPP;
		}

		dev_put(slave_dev);
		}

		return res;
		}