netdev - Nested function in drivers/of/of

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Message-Id: <200910071715.57249.jezz@sysmic.org>
Date:	Wed, 7 Oct 2009 17:15:57 +0200
From:	Jérôme Pouiller <jezz@...mic.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Andy Fleming <afleming@...escale.com>,
	netdev <netdev@...r.kernel.org>,
	linuxppc <linuxppc-dev@...ts.ozlabs.org>
Subject: Nested function in drivers/of/of_mdio.c

Dear,

I have a problem with commit 8bc487d150b939e69830c39322df4ee486efe381 
in file drivers/of/of_mdio.c in function of_phy_find_device.

As you see, this function define match() as a nested function. My 
compiler (powerpc-e500-linux-gnu-gcc-3.4.1) raise an error during link 
due to this nested definition:
  drivers/built-in.o(.text+0x5e2a4): In function `of_phy_find_device': /home/jezz/linux-next/drivers/of/of_mdio.c:107: 
undefined reference to `__trampoline_setup'

I am sure I could solve problem by rebuilding my toolchain. 
Nevertheless, I think nested function definition is not perfectly 
supported by all compilers. Also, I suggest to place function match() 
outside of scope of of_phy_find_device as in following patch.

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index bacaa53..c7b2e26 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -97,6 +97,10 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 }
 EXPORT_SYMBOL(of_mdiobus_register);

+static int match(struct device *dev, void *phy_np)
+{
+       return dev_archdata_get_node(&dev->archdata) == phy_np;
+}
 /**
  * of_phy_find_device - Give a PHY node, find the phy_device
  * @phy_np: Pointer to the phy's device tree node
@@ -106,11 +110,6 @@ EXPORT_SYMBOL(of_mdiobus_register);
 struct phy_device *of_phy_find_device(struct device_node *phy_np)
 {
        struct device *d;
-       int match(struct device *dev, void *phy_np)
-       {
-               return dev_archdata_get_node(&dev->archdata) == phy_np;
-       }
-
        if (!phy_np)
                return NULL;

What do you think about it?

Best regards,

-- 
Jérôme Pouiller (jezz AT sysmic DOT org)
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