linux-kernel - Re: [PATCH v4] uart: fix race between uart_put_char() and uart

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Message-ID: <20180712150438.GF22502@kroah.com>
Date:   Thu, 12 Jul 2018 17:04:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Tycho Andersen <tycho@...ho.ws>
Cc:     Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, "Serge E . Hallyn" <serge@...lyn.com>
Subject: Re: [PATCH v4] uart: fix race between uart_put_char() and
 uart_shutdown()

On Wed, Jul 11, 2018 at 10:07:44AM -0600, Tycho Andersen wrote:
> +	if (uport)
> +		spin_lock_irqsave(&uport->lock, flags);

That's the same thing as just calling uart_port_lock(), why aren't you
doing that?

thanks,

greg k-h