bonding: no longer use RTNL in bonding_show_slaves()

Slave devices are already RCU protected, simply
switch to bond_for_each_slave_rcu(),

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Link: https://lore.kernel.org/r/20240408190437.2214473-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 9132033f85fb0e33093e97c55f885a997c95cb4a..75ee7ca369034ef6fa58fc9399b566dd7044fedc 100644 (file)
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -170,10 +170,9 @@ static ssize_t bonding_show_slaves(struct device *d,
        struct slave *slave;
        int res = 0;
 
-       if (!rtnl_trylock())
-               return restart_syscall();
+       rcu_read_lock();
 
-       bond_for_each_slave(bond, slave, iter) {
+       bond_for_each_slave_rcu(bond, slave, iter) {
                if (res > (PAGE_SIZE - IFNAMSIZ)) {
                        /* not enough space for another interface name */
                        if ((PAGE_SIZE - res) > 10)
@@ -184,7 +183,7 @@ static ssize_t bonding_show_slaves(struct device *d,
                res += sysfs_emit_at(buf, res, "%s ", slave->dev->name);
        }
 
-       rtnl_unlock();
+       rcu_read_unlock();
 
        if (res)
                buf[res-1] = '\n'; /* eat the leftover space */