linux-kernel - Re: [PATCH] usb: Fix linker errors with CONFIG

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Date:	Sat, 16 Oct 2010 00:23:01 +0200
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc:	Greg KH <gregkh@...e.de>, Randy Dunlap <randy.dunlap@...cle.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	lud <linux-usb@...r.kernel.org>, Andiry Xu <andiry.xu@....com>,
	Dong Nguyen <dong.nguyen@....com>,
	Libin Yang <libin.yang@....com>
Subject: Re: [PATCH] usb: Fix linker errors with CONFIG_PM=n

On Fri, Oct 15, 2010 at 02:59:15PM -0700, Sarah Sharp wrote:
> Fix these linker errors when CONFIG_PM=n:
> 
> ERROR: "xhci_bus_resume" [drivers/usb/host/xhci-hcd.ko] undefined!
> ERROR: "xhci_bus_suspend" [drivers/usb/host/xhci-hcd.ko] undefined!
> 
> Reported-by: Randy Dunlap <randy.dunlap@...cle.com>
> Signed-off-by: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
> ---
> 
> Randy, this should fix your linker errors.  Without the patch, I get the
> same errors, and with the patch I don't.
> 
> Greg, this applies on top of the previous patch.
> 
>  drivers/usb/host/xhci-hub.c |    7 +------
>  drivers/usb/host/xhci.c     |    6 ------
>  drivers/usb/host/xhci.h     |   14 ++++++++++++++
>  3 files changed, 15 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
> index 7f2f63c..fef5a1f 100644
> --- a/drivers/usb/host/xhci-hub.c
> +++ b/drivers/usb/host/xhci-hub.c
> @@ -742,9 +742,4 @@ int xhci_bus_resume(struct usb_hcd *hcd)
>  	return 0;
>  }
>  
> -#else
> -
> -#define	xhci_bus_suspend	NULL
> -#define	xhci_bus_resume		NULL
> -
> -#endif
> +#endif	/* CONFIG_PM */
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 9dc5be5..5d7d4e9 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -761,12 +761,6 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
>  	spin_unlock_irq(&xhci->lock);
>  	return 0;
>  }
> -
> -#else
> -
> -#define	xhci_suspend	NULL
> -#define	xhci_resume	NULL
> -
>  #endif	/* CONFIG_PM */
>  
>  /*-------------------------------------------------------------------------*/
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index c08928a..93d3bf4 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -1405,8 +1405,15 @@ int xhci_init(struct usb_hcd *hcd);
>  int xhci_run(struct usb_hcd *hcd);
>  void xhci_stop(struct usb_hcd *hcd);
>  void xhci_shutdown(struct usb_hcd *hcd);
> +
> +#ifdef	CONFIG_PM
>  int xhci_suspend(struct xhci_hcd *xhci);
>  int xhci_resume(struct xhci_hcd *xhci, bool hibernated);
> +#else
> +#define	xhci_suspend	NULL
> +#define	xhci_resume	NULL
> +#endif
> +

"static inline int xhci_suspend(struct xhci_hcd *) {}"
has the same effect but saves types


>  int xhci_get_frame(struct usb_hcd *hcd);
>  irqreturn_t xhci_irq(struct usb_hcd *hcd);
>  irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd);
> @@ -1481,8 +1488,15 @@ void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id,
>  int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex,
>  		char *buf, u16 wLength);
>  int xhci_hub_status_data(struct usb_hcd *hcd, char *buf);
> +
> +#ifdef CONFIG_PM
>  int xhci_bus_suspend(struct usb_hcd *hcd);
>  int xhci_bus_resume(struct usb_hcd *hcd);
> +#else
> +#define	xhci_bus_suspend	NULL
> +#define	xhci_bus_resume		NULL
> +#endif	/* CONFIG_PM */
> +
>  u32 xhci_port_state_to_neutral(u32 state);
>  int xhci_find_slot_id_by_port(struct xhci_hcd *xhci, u16 port);
>  void xhci_ring_device(struct xhci_hcd *xhci, int slot_id);
> -- 
> 1.6.3.3
> 
> --
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