linux-kernel - Re: [PATCH] usb: host: xhci: remove #ifdef around PM functions

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Date:   Fri, 21 Apr 2017 15:02:15 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Felipe Balbi <balbi@...com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Baolin Wang <baolin.wang@...aro.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: host: xhci: remove #ifdef around PM functions

On Fri, Apr 21, 2017 at 11:42:54PM +0200, Arnd Bergmann wrote:
> The #ifdef is slightly wrong as it doesn't cover the xhci_priv_resume_quirk()
> function, causing a harmless warning:
> 
> drivers/usb/host/xhci-plat.c:58:12: error: 'xhci_priv_resume_quirk' defined but not used [-Werror=unused-function]
>  static int xhci_priv_resume_quirk(struct usb_hcd *hcd)
> 
> A simpler way to do this correctly is to use __maybe_unused annotations
> that let the compiler silently drop the functions when there is no
> reference.
> 
> Fixes: b0c69b4bace3 ("usb: host: plat: Enable xHCI plat runtime PM")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/usb/host/xhci-plat.c | 12 ++++--------
>  drivers/usb/host/xhci.h      |  5 -----
>  2 files changed, 4 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 057571fab599..7c2a9e7c8e0f 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -355,8 +355,7 @@ static int xhci_plat_remove(struct platform_device *dev)
>  	return 0;
>  }
>  
> -#ifdef CONFIG_PM_SLEEP
> -static int xhci_plat_suspend(struct device *dev)
> +static int __maybe_unused xhci_plat_suspend(struct device *dev)
>  {
>  	struct usb_hcd	*hcd = dev_get_drvdata(dev);
>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
> @@ -378,7 +377,7 @@ static int xhci_plat_suspend(struct device *dev)
>  	return ret;
>  }
>  
> -static int xhci_plat_resume(struct device *dev)
> +static int __maybe_unused xhci_plat_resume(struct device *dev)
>  {
>  	struct usb_hcd	*hcd = dev_get_drvdata(dev);
>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
> @@ -393,10 +392,8 @@ static int xhci_plat_resume(struct device *dev)
>  
>  	return xhci_resume(xhci, 0);
>  }
> -#endif /* CONFIG_PM_SLEEP */
>  
> -#ifdef CONFIG_PM
> -static int xhci_plat_runtime_suspend(struct device *dev)
> +static int __maybe_unused xhci_plat_runtime_suspend(struct device *dev)
>  {
>  	struct usb_hcd  *hcd = dev_get_drvdata(dev);
>  	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> @@ -404,14 +401,13 @@ static int xhci_plat_runtime_suspend(struct device *dev)
>  	return xhci_suspend(xhci, true);
>  }
>  
> -static int xhci_plat_runtime_resume(struct device *dev)
> +static int __maybe_unused xhci_plat_runtime_resume(struct device *dev)
>  {
>  	struct usb_hcd  *hcd = dev_get_drvdata(dev);
>  	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
>  
>  	return xhci_resume(xhci, 0);
>  }
> -#endif /* CONFIG_PM */
>  
>  static const struct dev_pm_ops xhci_plat_pm_ops = {
>  	SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index cae8fb901aa8..73a28a986d5e 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -2004,13 +2004,8 @@ void xhci_init_driver(struct hc_driver *drv,
>  int xhci_disable_slot(struct xhci_hcd *xhci,
>  			struct xhci_command *command, u32 slot_id);
>  
> -#ifdef	CONFIG_PM
>  int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup);
>  int xhci_resume(struct xhci_hcd *xhci, bool hibernated);
> -#else
> -#define	xhci_suspend	NULL
> -#define	xhci_resume	NULL
> -#endif
>  
>  irqreturn_t xhci_irq(struct usb_hcd *hcd);
>  irqreturn_t xhci_msi_irq(int irq, void *hcd);
> -- 
> 2.9.0
>