Hello,

On 28/07/2022 07:18, Eric Dumazet wrote:

From: Eric Dumazet <edumazet@google.com>

While investigating a separate rose issue [1], and enabling
CONFIG_NET_DEV_REFCNT_TRACKER=y, Bernard reported an orthogonal ax25 issue [2]

An ax25_dev can be used by one (or many) struct ax25_cb.
We thus need different dev_tracker, one per struct ax25_cb.

After this patch is applied, we are able to focus on rose.

FYI, we got a small conflict when merging -net in net-next in the MPTCP
tree due to this patch applied in -net:

  d7c4c9e075f8 ("ax25: fix incorrect dev_tracker usage")

and this one from net-next:

  d62607c3fe45 ("net: rename reference+tracking helpers")

The conflict has been resolved on our side[1] and the resolution we
suggest is attached to this email.

I'm sharing this thinking it can help others but if it only creates
noise, please tell me! :-)

Cheers,
Matt

[1] https://github.com/multipath-tcp/mptcp_net-next/commit/b01791aa6b6c
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