[patch 13/87] bonding: fix alb mode locking regression

Greg KH
2009-06-09T10:18:28Z

[-- Attachment #1: bonding-fix-alb-mode-locking-regression.patch --]
[-- Type: text/plain, Size: 1724 bytes --]

2.6.29-stable review patch. If anyone has any objections, please let us know.

------------------

From: Jay Vosburgh <fubar@us.ibm.com>

[ Upstream commit 815bcc2719c12b6f5b511706e2d19728e07f0b02 ]

Fix locking issue in alb MAC address management; removed
incorrect locking and replaced with correct locking. This bug was
introduced in commit 059fe7a578fba5bbb0fdc0365bfcf6218fa25eb0
("bonding: Convert locks to _bh, rework alb locking for new locking")

Bug reported by Paul Smith <paul@mad-scientist.net>, who also
tested the fix.

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/net/bonding/bond_alb.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)

--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -1739,9 +1739,6 @@ int bond_alb_set_mac_address(struct net_
}
}

- write_unlock_bh(&bond->curr_slave_lock);
- read_unlock(&bond->lock);
-
if (swap_slave) {
alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
@@ -1749,16 +1746,15 @@ int bond_alb_set_mac_address(struct net_
alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
bond->alb_info.rlb_enabled);

+ read_lock(&bond->lock);
alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
if (bond->alb_info.rlb_enabled) {
/* inform clients mac address has changed */
rlb_req_update_slave_clients(bond, bond->curr_active_slave);
}
+ read_unlock(&bond->lock);
}

- read_lock(&bond->lock);
- write_lock_bh(&bond->curr_slave_lock);
-
return 0;
}