linux-kernel - Re: [RFC/PATCH 3/3] usb/xhci-plat: remove unnecessary #ifdef checks for CONFIG_PM

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Message-ID: <20131213154656.GA6006@psi-dev26.jf.intel.com>
Date:	Fri, 13 Dec 2013 07:46:56 -0800
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, sarah.a.sharp@...ux.intel.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org, santosh.shilimkar@...com
Subject: Re: [RFC/PATCH 3/3] usb/xhci-plat: remove unnecessary #ifdef checks
 for CONFIG_PM_SLEEP

On Fri, Dec 13, 2013 at 09:19:34AM +0100, Ulf Hansson wrote:
> On 13 December 2013 06:18, David Cohen <david.a.cohen@...ux.intel.com> wrote:
> > From: Santosh Shilimkar <santosh.shilimkar@...com>
> >
> > Drivers using SET_*_PM_OPS() no longer need to #ifdef for CONFIG_PM_*
> > So, let's remove the unnecessary #ifdef's.
> >
> > Signed-off-by: Santosh Shilimkar <santosh.shilimkar@...com>
> > Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
> > ---
> >  drivers/usb/host/xhci-plat.c | 7 +------
> >  1 file changed, 1 insertion(+), 6 deletions(-)
> >
> > diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> > index d9c169f470d3..b1d93c344e04 100644
> > --- a/drivers/usb/host/xhci-plat.c
> > +++ b/drivers/usb/host/xhci-plat.c
> > @@ -197,7 +197,6 @@ static int xhci_plat_remove(struct platform_device *dev)
> >         return 0;
> >  }
> >
> > -#ifdef CONFIG_PM
> 
> I think you can solve this in another way.
> 
> As a start, I would suggest to change above to CONFIG_PM_SLEEP
> 
> >  static int xhci_plat_suspend(struct device *dev)
> >  {
> >         struct usb_hcd  *hcd = dev_get_drvdata(dev);
> > @@ -217,10 +216,6 @@ static int xhci_plat_resume(struct device *dev)
> >  static const struct dev_pm_ops xhci_plat_pm_ops = {
> >         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
> >  };
> > -#define DEV_PM_OPS     (&xhci_plat_pm_ops)
> > -#else
> > -#define DEV_PM_OPS     NULL
> > -#endif /* CONFIG_PM */
> 
> Remove the use of DEV_PM_OPS define. Instead use below macro and
> outside #ifdef CONFIG_PM_SLEEP.
> 
> "static SIMPLE_DEV_PM_OPS(xhci_plat_pm_ops, xhci_plat_suspend,
> xhci_plat_resume)"
> 
> That should do the trick I believe, without the need for changing the
> existing SET_SYSTEM_SLEEP_PM_OPS macro in patch1.

Yes, it does. That matches my suggestion in this e-mail:
http://marc.info/?l=linux-kernel&m=138690490016503&w=2

But I personally don't like #ifdef's. In this case, SET_*_PM_OPS()
macros handle #ifdef's when setting the callbacks. My intention is to
extend it to callbacks' implementation too making the code cleaner

Br, David Cohen

> 
> Kind regards
> Ulf Hansson
> 
> >
> >  #ifdef CONFIG_OF
> >  static const struct of_device_id usb_xhci_of_match[] = {
> > @@ -235,7 +230,7 @@ static struct platform_driver usb_xhci_driver = {
> >         .remove = xhci_plat_remove,
> >         .driver = {
> >                 .name = "xhci-hcd",
> > -               .pm = DEV_PM_OPS,
> > +               .pm = &xhci_plat_pm_ops,
> >                 .of_match_table = of_match_ptr(usb_xhci_of_match),
> >         },
> >  };
> > --
> > 1.8.4.2
> >
> > --
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