USB: use MII hooks only if CONFIG_MII is enabled

Fix mcs7830 patch

The recent mcs7830 update to make the MII support sharable goofed various
pre-existing configurations in two ways:

  - it made the usbnet infrastructure reference MII symbols even
    when they're not needed in the kernel being built

  - it didn't enable MII along with the mcs7830 minidriver

This patch fixes these two problems.

However, there does seem to be a Kconfig reverse dependency bug in that MII
gets wrongly enabled in some cases (like USBNET=y and USBNET_MII=n); I think
I've noticed that same problem in other situations too.  So the result can
mean kernels being bloated by stuff that's needlessly enabled ... better
than wrongly being disabled, but contributing to bloat.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 39 insertions, 27 deletions

diff --git a/drivers/usb/net/Kconfig b/drivers/usb/net/Kconfig
index 454a186b64ad..e081836014ac 100644
--- a/drivers/usb/net/Kconfig
+++ b/drivers/usb/net/Kconfig
@@ -92,8 +92,13 @@ config USB_RTL8150
           To compile this driver as a module, choose M here: the
           module will be called rtl8150.
 
+config USB_USBNET_MII
+        tristate
+        default n
+
 config USB_USBNET
         tristate "Multi-purpose USB Networking Framework"
+        select MII if USBNET_MII != n
         ---help---
           This driver supports several kinds of network links over USB,
           with "minidrivers" built around a common network driver core
@@ -129,7 +134,7 @@ config USB_NET_AX8817X
         tristate "ASIX AX88xxx Based USB 2.0 Ethernet Adapters"
         depends on USB_USBNET && NET_ETHERNET
         select CRC32
-        select MII
+        select USB_USBNET_MII
         default y
         help
           This option adds support for ASIX AX88xxx based USB 2.0
@@ -210,6 +215,7 @@ config USB_NET_PLUSB
 config USB_NET_MCS7830
         tristate "MosChip MCS7830 based Ethernet adapters"
         depends on USB_USBNET
+        select USB_USBNET_MII
         help
           Choose this option if you're using a 10/100 Ethernet USB2
           adapter based on the MosChip 7830 controller. This includes
diff --git a/drivers/usb/net/usbnet.c b/drivers/usb/net/usbnet.c
index 40873635d80e..760b5327b81b 100644
--- a/drivers/usb/net/usbnet.c
+++ b/drivers/usb/net/usbnet.c
@@ -669,6 +669,9 @@ done:
  * they'll probably want to use this base set.
  */
 
+#if defined(CONFIG_MII) || defined(CONFIG_MII_MODULE)
+#define HAVE_MII
+
 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
 {
         struct usbnet *dev = netdev_priv(net);
@@ -699,20 +702,6 @@ int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
 }
 EXPORT_SYMBOL_GPL(usbnet_set_settings);
 
-
-void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
-{
-        struct usbnet *dev = netdev_priv(net);
-
-        /* REVISIT don't always return "usbnet" */
-        strncpy (info->driver, driver_name, sizeof info->driver);
-        strncpy (info->version, DRIVER_VERSION, sizeof info->version);
-        strncpy (info->fw_version, dev->driver_info->description,
-                sizeof info->fw_version);
-        usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
-}
-EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
-
 u32 usbnet_get_link (struct net_device *net)
 {
         struct usbnet *dev = netdev_priv(net);
@@ -730,40 +719,57 @@ u32 usbnet_get_link (struct net_device *net)
 }
 EXPORT_SYMBOL_GPL(usbnet_get_link);
 
-u32 usbnet_get_msglevel (struct net_device *net)
+int usbnet_nway_reset(struct net_device *net)
 {
         struct usbnet *dev = netdev_priv(net);
 
-        return dev->msg_enable;
+        if (!dev->mii.mdio_write)
+                return -EOPNOTSUPP;
+
+        return mii_nway_restart(&dev->mii);
 }
-EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
+EXPORT_SYMBOL_GPL(usbnet_nway_reset);
 
-void usbnet_set_msglevel (struct net_device *net, u32 level)
+#endif  /* HAVE_MII */
+
+void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
 {
         struct usbnet *dev = netdev_priv(net);
 
-        dev->msg_enable = level;
+        /* REVISIT don't always return "usbnet" */
+        strncpy (info->driver, driver_name, sizeof info->driver);
+        strncpy (info->version, DRIVER_VERSION, sizeof info->version);
+        strncpy (info->fw_version, dev->driver_info->description,
+                sizeof info->fw_version);
+        usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
 }
-EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
+EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
 
-int usbnet_nway_reset(struct net_device *net)
+u32 usbnet_get_msglevel (struct net_device *net)
 {
         struct usbnet *dev = netdev_priv(net);
 
-        if (!dev->mii.mdio_write)
-                return -EOPNOTSUPP;
+        return dev->msg_enable;
+}
+EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
 
-        return mii_nway_restart(&dev->mii);
+void usbnet_set_msglevel (struct net_device *net, u32 level)
+{
+        struct usbnet *dev = netdev_priv(net);
+
+        dev->msg_enable = level;
 }
-EXPORT_SYMBOL_GPL(usbnet_nway_reset);
+EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
 
 /* drivers may override default ethtool_ops in their bind() routine */
 static struct ethtool_ops usbnet_ethtool_ops = {
+#ifdef  HAVE_MII
         .get_settings           = usbnet_get_settings,
         .set_settings           = usbnet_set_settings,
-        .get_drvinfo            = usbnet_get_drvinfo,
         .get_link               = usbnet_get_link,
         .nway_reset             = usbnet_nway_reset,
+#endif
+        .get_drvinfo            = usbnet_get_drvinfo,
         .get_msglevel           = usbnet_get_msglevel,
         .set_msglevel           = usbnet_set_msglevel,
 };