rtnetlink: do not depend on RTNL in rtnl_fill_proto_down()

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Change dev_change_proto_down() and dev_change_proto_down_reason()
to write once on dev->proto_down and dev->proto_down_reason.

Then rtnl_fill_proto_down() can use READ_ONCE() annotations
and run locklessly.

rtnl_proto_down_size() should assume worst case,
because readng dev->proto_down_reason multiple
times would be racy without RTNL in the future.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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Eric Dumazet 2024-05-03 19:20:57 +00:00 • committed by Paolo Abeni

parent 6747a5d499

commit 6890ab31d1

2 changed files with 11 additions and 8 deletions

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11

net/core/dev.c

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8

net/core/rtnetlink.c

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