linux-kernel - Re: [PATCH 1/2] usb: typec: Add USB Power Delivery sink port support

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Date:	Fri, 15 Jul 2016 10:44:10 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc:	Bin Gao <bin.gao@...ux.intel.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Bin Gao <bin.gao@...el.com>,
	Chandra Sekhar Anagani <chandra.sekhar.anagani@...el.com>
Subject: Re: [PATCH 1/2] usb: typec: Add USB Power Delivery sink port support

On Fri, 2016-07-15 at 10:25 +0300, Felipe Balbi wrote:
> > +int pd_sink_queue_msg(struct pd_sink_msg *msg)
> > +{
> > +     unsigned long flags;
> > +     struct pd_sink_port *port;
> > +
> > +     if (msg->port < 0 || msg->port >= MAX_NR_SINK_PORTS) {
> > +             pr_err("Invalid port number\n");
> > +             return -EINVAL;
> > +     }
> > +
> > +     port = sink_ports[msg->port];
> > +
> > +     spin_lock_irqsave(&port->rx_lock, flags);
> > +     list_add_tail(&msg->list, &port->rx_list);
> > +     spin_unlock_irqrestore(&port->rx_lock, flags);
> > +
> > +     queue_work(port->rx_wq, &port->rx_work);
> 
> can we really queue several messages at a time? It seems unfeasible to
> me. It's not like we can queue several power request in a role. Why do
> you need this workqueue? Why don't you process message here, in place?

A reset can come at any time.

	Regards
		Oliver