linux-kernel - Re: UART/TTY console deadlock

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Date:   Thu, 9 Jul 2020 22:22:29 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Raul Rangel <rrangel@...gle.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "S, Shirish" <Shirish.S@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        John Ogness <john.ogness@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: UART/TTY console deadlock

On (20/07/08 11:52), Petr Mladek wrote:
> 
> I still believe that this is a false positive.

I've no problems with that. The thing that I'm trying to improve here is the
fact that from lockdep's point of view there are no false positives. lockdep
reports the problem and then waves good bye. It disables itself. There might
be some real suspend locking problems on some particular setups, but it's
hard to tell, because console startup blows up the lockdep first.

	-ss