Re: [PATCH 2/2] usbnet: use MII hooks only if CONFIG_MII is enabled

David Brownell
2006-10-28T21:10:21Z

On Saturday 28 October 2006 4:21 am, Christoph Hellwig wrote:

> This is really awkward and against what we do in any other driver.

Awkward, yes -- which is why I posted the non-awkward version,
which is repeated below. (No thanks to "diff" for making the
patch ugly though; the resulting code is clean and non-awkward,
moving that function helped.)

Against what other drivers do? Since "usbnet.c" is infrastructure
code, not a driver, your comment can't apply. Infrastructure uses
conditional compilation routinely in such cases.

But remember that the actual drivers follow the standard convention
("select MII") given Randy's patch #1 of 2.

- Dave

-------------------------
The usbnet infrastructure must not reference MII symbols unless they're
provided in the kernel being built. This extends also to the ethtool
hooks that reference those symbols.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

Index: g26/drivers/usb/net/usbnet.c
===================================================================
--- g26.orig/drivers/usb/net/usbnet.c 2006-10-24 18:29:28.000000000 -0700
+++ g26/drivers/usb/net/usbnet.c 2006-10-25 19:07:16.000000000 -0700
@@ -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_devi
}
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 *
}
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,
};