linux-kernel - Re: [PATCH] tty/serial: do not free trasnmit buffer page under port lock

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Message-ID: <20181213094233.4nr2pa25tlczpvft@pathway.suse.cz>
Date:   Thu, 13 Dec 2018 10:42:33 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Waiman Long <longman@...hat.com>,
        Dmitry Safonov <dima@...sta.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] tty/serial: do not free trasnmit buffer page under port
 lock

On Thu 2018-12-13 13:58:39, Sergey Senozhatsky wrote:
> LKP has hit yet another circular locking dependency between uart
> console drivers and debugobjects [1]:
> 
> The patch fixes transmit buffer page free() in uart_shutdown() and,
> additionally, in uart_port_startup() (as was suggested by Dmitry Safonov).
> 
> [1] https://lore.kernel.org/lkml/20181211091154.GL23332@shao2-debian/T/#u
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr