linux-kernel - [PATCH 2/2] usbnet: use MII hooks only if CONFIG

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Date:	Wed, 25 Oct 2006 16:58:58 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	David Brownell <david-b@...bell.net>
Cc:	toralf.foerster@....de, netdev@...r.kernel.org,
	linux-usb-devel@...ts.sourceforge.net, link@...gy.org,
	greg@...ah.com, akpm@...l.org, zippel@...ux-m68k.org,
	torvalds@...l.org, linux-kernel@...r.kernel.org,
	dbrownell@...rs.sourceforge.net
Subject: [PATCH 2/2] usbnet: use MII hooks only if CONFIG_MII is enabled

On Wed, 25 Oct 2006 15:27:09 -0700 David Brownell wrote:

> Instead, "usbnet.c" should #ifdef the relevant ethtool hooks
> according to CONFIG_MII ... since it's completely legit to
> use usbnet with peripherals that don't need MII.

---
From: Randy Dunlap <randy.dunlap@...cle.com>

usbnet driver should use mii_*() interfaces if they are available
in the kernel (config enabled) but usbnet does not require or depend
on these interfaces.

Build tested with CONFIG_MII=y, m, n.

Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
---
 drivers/usb/net/usbnet.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

--- linux-2619-rc3-pv.orig/drivers/usb/net/usbnet.c
+++ linux-2619-rc3-pv/drivers/usb/net/usbnet.c
@@ -47,6 +47,12 @@
 
 #define DRIVER_VERSION		"22-Aug-2005"
 
+#if defined(CONFIG_MII) || defined(CONFIG_MII_MODULE)
+#define HAVE_MII		1
+#else
+#define HAVE_MII		0
+#endif
+
 
 /*-------------------------------------------------------------------------*/
 
@@ -676,7 +682,10 @@ int usbnet_get_settings (struct net_devi
 	if (!dev->mii.mdio_read)
 		return -EOPNOTSUPP;
 
+#if HAVE_MII
 	return mii_ethtool_gset(&dev->mii, cmd);
+#endif
+	return -EOPNOTSUPP;
 }
 EXPORT_SYMBOL_GPL(usbnet_get_settings);
 
@@ -688,7 +697,11 @@ int usbnet_set_settings (struct net_devi
 	if (!dev->mii.mdio_write)
 		return -EOPNOTSUPP;
 
+#if HAVE_MII
 	retval = mii_ethtool_sset(&dev->mii, cmd);
+#else
+	retval = -EOPNOTSUPP;
+#endif
 
 	/* link speed/duplex might have changed */
 	if (dev->driver_info->link_reset)
@@ -721,9 +734,11 @@ u32 usbnet_get_link (struct net_device *
 	if (dev->driver_info->check_connect)
 		return dev->driver_info->check_connect (dev) == 0;
 
+#if HAVE_MII
 	/* if the device has mii operations, use those */
 	if (dev->mii.mdio_read)
 		return mii_link_ok(&dev->mii);
+#endif
 
 	/* Otherwise, say we're up (to avoid breaking scripts) */
 	return 1;
@@ -753,7 +768,10 @@ int usbnet_nway_reset(struct net_device 
 	if (!dev->mii.mdio_write)
 		return -EOPNOTSUPP;
 
+#if HAVE_MII
 	return mii_nway_restart(&dev->mii);
+#endif
+	return -EOPNOTSUPP;
 }
 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
 
-
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