From e9fe8efeeae11f19bb6fafd6153ec77deaeb4b83 Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Tue, 9 Sep 2014 23:17:01 +0200 Subject: [PATCH] bonding: procfs: clean bond->lock usage and use RCU Use RCU to protect against slave release, the proc show function will sync with the bond destruction by the proc locks and the fact that the bond is released after NETDEV_UNREGISTER which causes the bonding to remove the proc entry. Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- drivers/net/bonding/bond_procfs.c | 16 +++------------- 1 file changed, 3 insertions(+), 13 deletions(-) diff --git a/drivers/net/bonding/bond_procfs.c b/drivers/net/bonding/bond_procfs.c index 1a9fe1ba4c60..bb09d0442aa8 100644 --- a/drivers/net/bonding/bond_procfs.c +++ b/drivers/net/bonding/bond_procfs.c @@ -7,21 +7,18 @@ static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos) __acquires(RCU) - __acquires(&bond->lock) { struct bonding *bond = seq->private; struct list_head *iter; struct slave *slave; loff_t off = 0; - /* make sure the bond won't be taken away */ rcu_read_lock(); - read_lock(&bond->lock); if (*pos == 0) return SEQ_START_TOKEN; - bond_for_each_slave(bond, slave, iter) + bond_for_each_slave_rcu(bond, slave, iter) if (++off == *pos) return slave; @@ -37,12 +34,9 @@ static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos) ++*pos; if (v == SEQ_START_TOKEN) - return bond_first_slave(bond); + return bond_first_slave_rcu(bond); - if (bond_is_last_slave(bond, v)) - return NULL; - - bond_for_each_slave(bond, slave, iter) { + bond_for_each_slave_rcu(bond, slave, iter) { if (found) return slave; if (slave == v) @@ -53,12 +47,8 @@ static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos) } static void bond_info_seq_stop(struct seq_file *seq, void *v) - __releases(&bond->lock) __releases(RCU) { - struct bonding *bond = seq->private; - - read_unlock(&bond->lock); rcu_read_unlock(); } -- 2.20.1