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

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Message-ID: <1289960532.1663.24.camel@leonhard>
Date:	Wed, 17 Nov 2010 11:22:12 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Randy Dunlap <randy.dunlap@...cle.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

2010-11-16 (화), 09:14 -0800, Randy Dunlap:
> Hi,
> 

Hi, Randy


> 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.
> 

At first glance, I've noticed that the code above could make a NULL
dereference so I added NULL check prior to the line.

But after reading more code I realized that other pci-functions called
in acpi_set_WOL() would not work with NULL pci_dev pointer also. And I
found all callers of the acpi_set_WOL() already checked NULL pointer
before the call. Finally I could remove the NULL check and leave the
code as is. That's how it works. :)

Thanks.

-- 
Regards,
Namhyung Kim


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