From e934dd7862e7f613b2ce9730d548a0a70913c8f7 Mon Sep 17 00:00:00 2001 From: Jay Vosburgh Date: Thu, 17 Jan 2008 16:24:57 -0800 Subject: [PATCH] bonding: fix locking in sysfs primary/active selection Fix the functions that store the primary and active slave options via sysfs to hold the correct locks in the correct order. The bond_change_active_slave and bond_select_active_slave functions both require rtnl, bond->lock for read and curr_slave_lock for write_bh, and no other locks. This is so that the lower level mode-specific functions (notably for balance-alb mode) can release locks down to just rtnl in order to call, e.g., dev_set_mac_address with the locks it expects (rtnl only). Signed-off-by: Jay Vosburgh Signed-off-by: Andy Gospodarek Signed-off-by: Jeff Garzik --- drivers/net/bonding/bond_sysfs.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c index 11b76b352415..28a2d803e7e5 100644 --- a/drivers/net/bonding/bond_sysfs.c +++ b/drivers/net/bonding/bond_sysfs.c @@ -1075,7 +1075,10 @@ static ssize_t bonding_store_primary(struct device *d, struct slave *slave; struct bonding *bond = to_bond(d); - write_lock_bh(&bond->lock); + rtnl_lock(); + read_lock(&bond->lock); + write_lock_bh(&bond->curr_slave_lock); + if (!USES_PRIMARY(bond->params.mode)) { printk(KERN_INFO DRV_NAME ": %s: Unable to set primary slave; %s is in mode %d\n", @@ -1109,8 +1112,8 @@ static ssize_t bonding_store_primary(struct device *d, } } out: - write_unlock_bh(&bond->lock); - + write_unlock_bh(&bond->curr_slave_lock); + read_unlock(&bond->lock); rtnl_unlock(); return count; @@ -1190,7 +1193,8 @@ static ssize_t bonding_store_active_slave(struct device *d, struct bonding *bond = to_bond(d); rtnl_lock(); - write_lock_bh(&bond->lock); + read_lock(&bond->lock); + write_lock_bh(&bond->curr_slave_lock); if (!USES_PRIMARY(bond->params.mode)) { printk(KERN_INFO DRV_NAME @@ -1247,7 +1251,8 @@ static ssize_t bonding_store_active_slave(struct device *d, } } out: - write_unlock_bh(&bond->lock); + write_unlock_bh(&bond->curr_slave_lock); + read_unlock(&bond->lock); rtnl_unlock(); return count; -- 2.20.1