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[PATCH] bonding: fix deadlock on high loads in bond_alb_monitor() 

In bond_alb_monitor the bond->curr_slave_lock write lock is taken
and then dev_set_promiscuity maybe called which can take some time,
depending on the network HW. If a network IRQ for this card come in
the softirq handler maybe try to deliver more packets which end up in
a request to the read lock of bond->curr_slave_lock -> deadlock.
This issue was found by a test lab during network stress tests, this patch
disable the softirq handler for this case and solved the issue.

Signed-off-by: Karsten Keil <kkeil@suse.de>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Karsten Keil 2006-09-29 23:28:42 -07:00 committed by Jeff Garzik
parent 0a07bc645e
commit 39984a9fad
1 changed files with 2 additions and 2 deletions
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4
drivers/net/bonding/bond_alb.c
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@ -1433,7 +1433,7 @@ void bond_alb_monitor(struct bonding *bond)
* write lock to protect from other code that also
* sets the promiscuity.
*/
write_lock(&bond->curr_slave_lock);
write_lock_bh(&bond->curr_slave_lock);
if (bond_info->primary_is_promisc &&
(++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
@ -1448,7 +1448,7 @@ void bond_alb_monitor(struct bonding *bond)
bond_info->primary_is_promisc = 0;
}
write_unlock(&bond->curr_slave_lock);
write_unlock_bh(&bond->curr_slave_lock);
if (bond_info->rlb_rebalance) {
bond_info->rlb_rebalance = 0;