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

[Tycho Andersen]

On Thu, Jul 12, 2018 at 05:04:38PM +0200, Greg Kroah-Hartman wrote:
> 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?

Because the compiler can't seem to "see" through the macros/ref calls,
and I get the warning I mentioned here if I use them:

https://lkml.org/lkml/2018/7/6/840

Tycho