Re: [PATCH v4] uart: fix race between uart_put_char() and uart_shutdown()

[Greg Kroah-Hartman]

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