Re: [PATCH] usb: ulpi: don't register drivers if bus doesn't exist

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

On Fri, May 22, 2015 at 01:16:38PM +0300, Heikki Krogerus wrote:
> > > >>diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c
> > > >>index 0e6f968..0b0a5e7 100644
> > > >>--- a/drivers/usb/common/ulpi.c
> > > >>+++ b/drivers/usb/common/ulpi.c
> > > >>@@ -132,6 +132,10 @@ int ulpi_register_driver(struct ulpi_driver *drv)
> > > >>  	if (!drv->probe)
> > > >>  		return -EINVAL;
> > > >>+	/* Was the bus registered successfully? */
> > > >>+	if (!ulpi_bus.p)
> > > >>+		return -ENODEV;
> > 
> > I think we need to warn in this case. How about:
> > 
> >         if (unlikely(WARN_ON(!ulpi_bus.p)))
> >                 return -ENODEV;
> 
> I think we should also return -EAGAIN here.

The same check needs to be added to ulpi_register_interface() as well.


Cheers,

-- 
heikki