Hello,
On Fri, Nov 22, 2019 at 10:00:53AM +0000, Andy Duan wrote:
> From: Fugang Duan <fugang.duan@xxxxxxx>
>
> commit dbdda842fe96 ("printk: Add console owner and waiter logic to
> load balance console writes") introduces the lockdep issue for imx
> serial driver in sysrq case:
> CPU0 CPU1
> ---- ----
> lock(&port_lock_key);
> lock(console_owner);
> lock(&port_lock_key);
> lock(console_owner);
>
> It should unlock port_lock_key in handle_sysrq().
I already discussed this problem some time ago but then failed to
complete the topic. You might want to look at the old discussion, see
https://www.spinics.net/lists/kernel/msg3266353.html.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
