Cross-merge networking fixes after downstream PR.
No conflicts (sort of) and no adjacent changes.
This merge reverts commit
b3c9e65eb227 ("net: hsr: remove seqnr_lock")
from net, as it was superseded by
commit
430d67bdcb04 ("net: hsr: Use the seqnr lock for frames received via interlink port.")
in net-next.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>