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net: dummy: do not acquire RTNL for too long

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Instead of holding RTNL for an arbitrary amount of time,
call register_netdev() for each dummy device created
at module loading time.

Tested:

modprobe dummy numdummies=10000

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260427091016.737015-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-04-27 09:10:16 +00:00 committed by Jakub Kicinski
parent 790ead9394
commit bed510e440
1 changed files with 1 additions and 5 deletions
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6
drivers/net/dummy.c
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@ -158,7 +158,7 @@ static int __init dummy_init_one(void)
return -ENOMEM;
dev_dummy->rtnl_link_ops = &dummy_link_ops;
err = register_netdevice(dev_dummy);
err = register_netdev(dev_dummy);
if (err < 0)
goto err;
return 0;
@ -176,15 +176,11 @@ static int __init dummy_init_module(void)
if (err < 0)
return err;
rtnl_net_lock(&init_net);
for (i = 0; i < numdummies && !err; i++) {
err = dummy_init_one();
cond_resched();
}
rtnl_net_unlock(&init_net);
if (err < 0)
rtnl_link_unregister(&dummy_link_ops);