Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote:
> From: Johannes Berg <johannes.berg@xxxxxxxxx>
>
> Again new complaints surfaced that we had broken the ABI here,
> although previously all the userspace tools had agreed that it
> was their mistake and fixed it. Yet now there are cases (e.g.
> RHEL) that want to run old userspace with newer kernels, and
> thus are broken.
>
> Since this is a bit of a whack-a-mole thing, change the whole
> extensibility scheme of rfkill to no longer just rely on the
> message lengths, but instead require userspace to opt in via a
> new ioctl to a given maximum event size that it is willing to
> understand.
>
> By default, set that to RFKILL_EVENT_SIZE_V1 (8), so that the
> behaviour for userspace not calling the ioctl will look as if
> it's just running on an older kernel.
>
> Fixes: 14486c82612a ("rfkill: add a reason to the HW rfkill state")
> Cc: stable@xxxxxxxxxxxxxxx # 5.11+
> Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Patch applied to wireless-next.git, thanks.
54f586a91532 rfkill: make new event layout opt-in
--
https://patchwork.kernel.org/project/linux-wireless/patch/20220316212749.16491491b270.Ifcb1950998330a596f29a2a162e00b7546a1d6d0@changeid/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
