linux-kernel - Re: [PATCH] 3c59x: fix build failure on !CONFIG

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Message-Id: <20101116091408.abd36ec8.randy.dunlap@oracle.com>
Date:	Tue, 16 Nov 2010 09:14:08 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	Steffen Klassert <klassert@...hematik.tu-chemnitz.de>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] 3c59x: fix build failure on !CONFIG_PCI

On Wed, 17 Nov 2010 00:27:51 +0900 Namhyung Kim wrote:

> VORTEX_PCI() could return NULL so it needs to be casted before
> accessing any member of struct pci_dev. This fixes following
> build failure. Likewise VORTEX_EISA() was changed also.
> 
>   CC [M]  drivers/net/3c59x.o
> drivers/net/3c59x.c: In function 'acpi_set_WOL':
> drivers/net/3c59x.c:3211:39: warning: dereferencing 'void *' pointer
> drivers/net/3c59x.c:3211:39: error: request for member 'current_state' in something not a structure or union
> make[3]: *** [drivers/net/3c59x.o] Error 1
> make[2]: *** [drivers/net/3c59x.o] Error 2
> make[1]: *** [sub-make] Error 2
> make: *** [all] Error 2
> 
> Signed-off-by: Namhyung Kim <namhyung@...il.com>
> ---
>  drivers/net/3c59x.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
> index e1da258..0a92436 100644
> --- a/drivers/net/3c59x.c
> +++ b/drivers/net/3c59x.c
> @@ -699,7 +699,8 @@ DEFINE_WINDOW_IO(32)
>  #define DEVICE_PCI(dev) NULL
>  #endif
>  
> -#define VORTEX_PCI(vp) (((vp)->gendev) ? DEVICE_PCI((vp)->gendev) : NULL)
> +#define VORTEX_PCI(vp)							\
> +	((struct pci_dev *) (((vp)->gendev) ? DEVICE_PCI((vp)->gendev) : NULL))
>  
>  #ifdef CONFIG_EISA
>  #define DEVICE_EISA(dev) (((dev)->bus == &eisa_bus_type) ? to_eisa_device((dev)) : NULL)
> @@ -707,7 +708,8 @@ DEFINE_WINDOW_IO(32)
>  #define DEVICE_EISA(dev) NULL
>  #endif
>  
> -#define VORTEX_EISA(vp) (((vp)->gendev) ? DEVICE_EISA((vp)->gendev) : NULL)
> +#define VORTEX_EISA(vp)							\
> +	((struct eisa_device *) (((vp)->gendev) ? DEVICE_EISA((vp)->gendev) : NULL))
>  
>  /* The action to take with a media selection timer tick.
>     Note that we deviate from the 3Com order by checking 10base2 before AUI.
> -- 

Hi,

Interesting patch.  I have reported this build error and looked
into fixing it, but did not come up with this solution.

Looking at it more:  if CONFIG_PCI is not enabled, DEVICE_PCI() is NULL.
That makes VORTEX_PCI() (with or without your patch) have a value of NULL.

Is the line with the reported syntax error (3211) executed in
function acpi_set_WOL() ?  If so, let's assume that vp->enable_wol is true.
Then what happens on line 3211 (or 3213 after your patch)?

		if (VORTEX_PCI(vp)->current_state < PCI_D3hot)
			return;

or if I am really confuzed this morning, please tell me how it works.

thanks,
---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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