linux-kernel - Re: [PATCH printk v2 4/4] printk: Ignore waiter on panic

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Date:   Mon, 23 Oct 2023 11:21:43 +0206
From:   John Ogness <john.ogness@...utronix.de>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH printk v2 4/4] printk: Ignore waiter on panic

On 2023-10-18, Petr Mladek <pmladek@...e.com> wrote:
> Well, I have spent some time thinking about possible scenarios and I would
> go even further. I would block also console_lock_spinning_enable()
> Also I would do the checks before taking console_owner_lock.
>
> It would make the behavior symmetric. And more importantly, it would prevent
> possible deadlocks caused by console_owner_lock.
>
> See the proposed patch below. I created it to see the changes in the
> code. Also I added info about possible scenarios and effects.

Reviewed-by: John Ogness <john.ogness@...utronix.de>

I will use your patch for the next version of this series.

John