acpi-wmi: Unmark as 'experimental'

[safe/jmp/linux-2.6] / drivers / virtio / virtio.c

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 7dddb18..018c070 100644 (file)
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -2,6 +2,9 @@
 #include <linux/spinlock.h>
 #include <linux/virtio_config.h>
 
+/* Unique numbering for virtio devices. */
+static unsigned int dev_index;
+
 static ssize_t device_show(struct device *_d,
                           struct device_attribute *attr, char *buf)
 {
@@ -68,31 +71,60 @@ static int virtio_uevent(struct device *_dv, struct kobj_uevent_env *env)
                              dev->id.device, dev->id.vendor);
 }
 
-static struct bus_type virtio_bus = {
-       .name  = "virtio",
-       .match = virtio_dev_match,
-       .dev_attrs = virtio_dev_attrs,
-       .uevent = virtio_uevent,
-};
-
 static void add_status(struct virtio_device *dev, unsigned status)
 {
        dev->config->set_status(dev, dev->config->get_status(dev) | status);
 }
 
+void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
+                                        unsigned int fbit)
+{
+       unsigned int i;
+       struct virtio_driver *drv = container_of(vdev->dev.driver,
+                                                struct virtio_driver, driver);
+
+       for (i = 0; i < drv->feature_table_size; i++)
+               if (drv->feature_table[i] == fbit)
+                       return;
+       BUG();
+}
+EXPORT_SYMBOL_GPL(virtio_check_driver_offered_feature);
+
 static int virtio_dev_probe(struct device *_d)
 {
-       int err;
+       int err, i;
        struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
        struct virtio_driver *drv = container_of(dev->dev.driver,
                                                 struct virtio_driver, driver);
+       u32 device_features;
 
+       /* We have a driver! */
        add_status(dev, VIRTIO_CONFIG_S_DRIVER);
+
+       /* Figure out what features the device supports. */
+       device_features = dev->config->get_features(dev);
+
+       /* Features supported by both device and driver into dev->features. */
+       memset(dev->features, 0, sizeof(dev->features));
+       for (i = 0; i < drv->feature_table_size; i++) {
+               unsigned int f = drv->feature_table[i];
+               BUG_ON(f >= 32);
+               if (device_features & (1 << f))
+                       set_bit(f, dev->features);
+       }
+
+       /* Transport features always preserved to pass to finalize_features. */
+       for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++)
+               if (device_features & (1 << i))
+                       set_bit(i, dev->features);
+
        err = drv->probe(dev);
        if (err)
                add_status(dev, VIRTIO_CONFIG_S_FAILED);
-       else
+       else {
+               dev->config->finalize_features(dev);
                add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
+       }
        return err;
 }
 
@@ -112,11 +144,20 @@ static int virtio_dev_remove(struct device *_d)
        return 0;
 }
 
+static struct bus_type virtio_bus = {
+       .name  = "virtio",
+       .match = virtio_dev_match,
+       .dev_attrs = virtio_dev_attrs,
+       .uevent = virtio_uevent,
+       .probe = virtio_dev_probe,
+       .remove = virtio_dev_remove,
+};
+
 int register_virtio_driver(struct virtio_driver *driver)
 {
+       /* Catch this early. */
+       BUG_ON(driver->feature_table_size && !driver->feature_table);
        driver->driver.bus = &virtio_bus;
-       driver->driver.probe = virtio_dev_probe;
-       driver->driver.remove = virtio_dev_remove;
        return driver_register(&driver->driver);
 }
 EXPORT_SYMBOL_GPL(register_virtio_driver);
@@ -132,7 +173,10 @@ int register_virtio_device(struct virtio_device *dev)
        int err;
 
        dev->dev.bus = &virtio_bus;
-       sprintf(dev->dev.bus_id, "%u", dev->index);
+
+       /* Assign a unique device index and hence name. */
+       dev->index = dev_index++;
+       dev_set_name(&dev->dev, "virtio%u", dev->index);
 
        /* We always start by resetting the device, in case a previous
         * driver messed it up.  This also tests that code path a little. */
@@ -162,4 +206,12 @@ static int virtio_init(void)
                panic("virtio bus registration failed");
        return 0;
 }
+
+static void __exit virtio_exit(void)
+{
+       bus_unregister(&virtio_bus);
+}
 core_initcall(virtio_init);
+module_exit(virtio_exit);
+
+MODULE_LICENSE("GPL");