Commit cedb743f authored by Veaceslav Falico's avatar Veaceslav Falico Committed by David S. Miller

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: default avatarVeaceslav Falico <vfalico@redhat.com>
Signed-off-by: default avatarNikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 72bb72b0
......@@ -1176,15 +1176,12 @@ static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *sla
*
* 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.
*/
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;
}
......
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