diff options
author | Veaceslav Falico <vfalico@redhat.com> | 2013-06-17 17:30:35 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2013-06-17 23:27:24 (GMT) |
commit | cedb743f3e8db12cc76a706888792497953e93bb (patch) | |
tree | d3e356ab352b1cd99f18fd46219472ab20a01d69 /drivers/net/bonding | |
parent | 72bb72b0d98847d22c6fae4e170121f3640f0f60 (diff) | |
download | linux-cedb743f3e8db12cc76a706888792497953e93bb.tar.xz |
bonding: don't call alb_set_slave_mac_addr() while atomic
alb_set_slave_mac_addr() sets the mac address in alb mode via
dev_set_mac_address(), which might sleep. It's called from
alb_handle_addr_collision_on_attach() in atomic context (under
read_lock(bond->lock)), thus triggering a bug.
Fix this by moving the lock inside alb_handle_addr_collision_on_attach().
v1->v2:
As Nikolay Aleksandrov noticed, we can drop the bond->lock completely.
Also, use bond_slave_has_mac(), when possible.
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/bonding')
-rw-r--r-- | drivers/net/bonding/bond_alb.c | 40 |
1 files changed, 5 insertions, 35 deletions
diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index a236234..27fe329 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -1175,16 +1175,13 @@ static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *sla * @slave. * * assumption: this function is called before @slave is attached to the - * bond slave list. - * - * caller must hold the bond lock for write since the mac addresses are compared - * and may be swapped. + * bond slave list. */ static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) { - struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave; + struct slave *tmp_slave1, *free_mac_slave = NULL; struct slave *has_bond_addr = bond->curr_active_slave; - int i, j, found = 0; + int i; if (bond->slave_cnt == 0) { /* this is the first slave */ @@ -1196,15 +1193,7 @@ static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slav * slaves in the bond. */ if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { - bond_for_each_slave(bond, tmp_slave1, i) { - if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, - slave->dev->dev_addr)) { - found = 1; - break; - } - } - - if (!found) + if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) return 0; /* Try setting slave mac to bond address and fall-through @@ -1215,19 +1204,8 @@ static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slav /* The slave's address is equal to the address of the bond. * Search for a spare address in the bond for this slave. */ - free_mac_slave = NULL; - bond_for_each_slave(bond, tmp_slave1, i) { - found = 0; - bond_for_each_slave(bond, tmp_slave2, j) { - if (ether_addr_equal_64bits(tmp_slave1->perm_hwaddr, - tmp_slave2->dev->dev_addr)) { - found = 1; - break; - } - } - - if (!found) { + if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { /* no slave has tmp_slave1's perm addr * as its curr addr */ @@ -1607,15 +1585,7 @@ int bond_alb_init_slave(struct bonding *bond, struct slave *slave) return res; } - /* caller must hold the bond lock for write since the mac addresses - * are compared and may be swapped. - */ - read_lock(&bond->lock); - res = alb_handle_addr_collision_on_attach(bond, slave); - - read_unlock(&bond->lock); - if (res) { return res; } |