linux-kernel - Re: [PATCH] drivercore: Add driver probe deferral mechanism

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Date:	Mon, 5 Mar 2012 14:15:28 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	linux-kernel@...r.kernel.org, Tony Lindgren <tony@...mide.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Arnd Bergmann <arnd@...db.de>, Dilan Lee <dilee@...dia.com>,
	Manjunath GKondaiah <manjunath.gkondaiah@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH] drivercore: Add driver probe deferral mechanism

On Mon, Mar 05, 2012 at 03:09:27PM -0700, Grant Likely wrote:
> On Mon, Mar 5, 2012 at 2:47 PM, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> > On Mon, Mar 05, 2012 at 08:47:41AM -0700, Grant Likely wrote:
> >> --- a/include/linux/device.h
> >> +++ b/include/linux/device.h
> >> @@ -587,6 +587,10 @@ struct device_dma_parameters {
> >>   * @mutex:   Mutex to synchronize calls to its driver.
> >>   * @bus:     Type of bus device is on.
> >>   * @driver:  Which driver has allocated this
> >> + * @deferred_probe: entry in deferred_probe_list which is used to retry the
> >> + *           binding of drivers which were unable to get all the resources
> >> + *           needed by the device; typically because it depends on another
> >> + *           driver getting probed first.
> >>   * @platform_data: Platform data specific to the device.
> >>   *           Example: For devices on custom boards, as typical of embedded
> >>   *           and SOC based hardware, Linux often uses platform_data to point
> >> @@ -646,6 +650,7 @@ struct device {
> >>       struct bus_type *bus;           /* type of bus device is on */
> >>       struct device_driver *driver;   /* which driver has allocated this
> >>                                          device */
> >> +     struct list_head        deferred_probe;
> >>       void            *platform_data; /* Platform specific data, device
> >>                                          core doesn't touch it */
> >>       struct dev_pm_info      power;
> >
> > This can go into the "struct device_private" structure instead, right?
> > That would be better to ensure that no non-driver-core code ever touches
> > this thing.
> 
> I don't see any reason why not.  I'll make the change and repost.

If you are going to repost, care to fix up your multi-line comment
blocks to follow the "standard" way of doing it?

That saves me doing the follow-on patch to do it myself :)

thanks,

greg k-h
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