Re: [PATCH v2 3/8] core: platform: wakeup the parent before trying any driver operations

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

On Mon, May 25, 2015 at 01:36:43PM -0400, Alan Stern wrote:
> On Mon, 25 May 2015, Andy Shevchenko wrote:
> 
> > From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> > 
> > If the parent is still suspended when a driver probe,
> > remove or shutdown is attempted, the result may be a
> > failure.
> > 
> > For example, if the parent is a PCI MFD device that has been
> > suspended when we try to probe our device, any register
> > reads will return 0xffffffff.
> > 
> > To fix the problem, making sure the parent is always awake
> > before using driver probe, remove or shutdown.
> > 
> > Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > ---
> >  drivers/base/platform.c | 21 ++++++++++++++++++++-
> 
> Why make the changes here rather than in dd.c?  Is there something 
> special about platform devices?

There isn't. That would definitely be better.


Thanks Alan,

-- 
heikki