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

[Alan Stern]

On Mon, 25 May 2015, Andy Shevchenko wrote:

> From: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxxxx>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> ---
>  drivers/base/platform.c | 21 ++++++++++++++++++++-

Why make the changes here rather than in dd.c?  Is there something 
special about platform devices?

Alan Stern

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