linux-kernel - systemd-rfkill regression on 5.11 and later kernels

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Date:   Thu, 18 Mar 2021 09:27:18 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Emmanuel Grumbach <emmanuel.grumbach@...el.com>
Cc:     linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: systemd-rfkill regression on 5.11 and later kernels

Hi,

we've received a bug report about rfkill change that was introduced in
5.11.  While the systemd-rfkill expects the same size of both read and
write, the kernel rfkill write cuts off to the old 8 bytes while read
gives 9 bytes, hence it leads the error:
  https://github.com/systemd/systemd/issues/18677
  https://bugzilla.opensuse.org/show_bug.cgi?id=1183147

As far as I understand from the log in the commit 14486c82612a, this
sounds like the intended behavior.  But if this was implemented in
that way just for the compatibility reason, it actually is worse,
introducing a regression. 

Although this can be addressed easily in the systemd side, the current
kernel behavior needs reconsideration, IMO.

thanks,

Takashi