diff options
| author | Eric Dumazet <edumazet@google.com> | 2024-02-07 18:35:14 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-02-09 06:08:51 +0300 |
| commit | e7689879d14ee730085c2f5974003c2d0ebbebc6 (patch) | |
| tree | 14577346aab60bf868e98dedcc645c609c3fe51b /net | |
| parent | fd0bb2c7ccd93ae308ca1317c04765b26e88e3a1 (diff) | |
| download | linux-e7689879d14ee730085c2f5974003c2d0ebbebc6.tar.xz | |
ethtool: do not use rtnl in ethnl_default_dumpit()
for_each_netdev_dump() can be used with RCU protection,
no need for rtnl if we are going to use dev_hold()/dev_put().
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20240207153514.3640952-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ethtool/netlink.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c index fe3553f60bf3..bd04f28d5cf4 100644 --- a/net/ethtool/netlink.c +++ b/net/ethtool/netlink.c @@ -477,11 +477,7 @@ out: return ret; } -/* Default ->dumpit() handler for GET requests. Device iteration copied from - * rtnl_dump_ifinfo(); we have to be more careful about device hashtable - * persistence as we cannot guarantee to hold RTNL lock through the whole - * function as rtnetnlink does. - */ +/* Default ->dumpit() handler for GET requests. */ static int ethnl_default_dumpit(struct sk_buff *skb, struct netlink_callback *cb) { @@ -490,14 +486,14 @@ static int ethnl_default_dumpit(struct sk_buff *skb, struct net_device *dev; int ret = 0; - rtnl_lock(); + rcu_read_lock(); for_each_netdev_dump(net, dev, ctx->pos_ifindex) { dev_hold(dev); - rtnl_unlock(); + rcu_read_unlock(); ret = ethnl_default_dump_one(skb, dev, ctx, genl_info_dump(cb)); - rtnl_lock(); + rcu_read_lock(); dev_put(dev); if (ret < 0 && ret != -EOPNOTSUPP) { @@ -507,7 +503,7 @@ static int ethnl_default_dumpit(struct sk_buff *skb, } ret = 0; } - rtnl_unlock(); + rcu_read_unlock(); return ret; } |