Merge branch 'net-netdevsim-fix-inconsistent-carrier-state-after-link-unlink'

Merge branch 'net-netdevsim-fix-inconsistent-carrier-state-after-link-unlink'

Yohei Kojima says:

====================
net: netdevsim: fix inconsistent carrier state after link/unlink

This series fixes netdevsim's inconsistent behavior between carrier
and link/unlink state.

More specifically, this fixes a bug that the carrier goes DOWN although
two netdevsim were peered, depending on the order of peering and ifup.
Especially in a NetworkManager-enabled environment, netdevsim test fails
because of this.

The first patch fixes the bug itself in netdevsim/bus.c by adding
netif_carrier_on() into a proper function. The second patch adds a
regression test for this bug.
====================

Link: https://patch.msgid.link/cover.1767624906.git.yk@y-koj.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>