virtio: add drv_to_virtio to make code clearly

Add drv_to_virtio wrapper to get virtio_driver from device_driver.

Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 4 insertions, 7 deletions

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 1346ae8e14f3..1c01ac3fad08 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -73,7 +73,7 @@ static int virtio_dev_match(struct device *_dv, struct device_driver *_dr)
         struct virtio_device *dev = dev_to_virtio(_dv);
         const struct virtio_device_id *ids;
 
-        ids = container_of(_dr, struct virtio_driver, driver)->id_table;
+        ids = drv_to_virtio(_dr)->id_table;
         for (i = 0; ids[i].device; i++)
                 if (virtio_id_match(dev, &ids[i]))
                         return 1;
@@ -97,8 +97,7 @@ 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);
+        struct virtio_driver *drv = drv_to_virtio(vdev->dev.driver);
 
         for (i = 0; i < drv->feature_table_size; i++)
                 if (drv->feature_table[i] == fbit)
@@ -111,8 +110,7 @@ static int virtio_dev_probe(struct device *_d)
 {
         int err, i;
         struct virtio_device *dev = dev_to_virtio(_d);
-        struct virtio_driver *drv = container_of(dev->dev.driver,
-                                                 struct virtio_driver, driver);
+        struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
         u32 device_features;
 
         /* We have a driver! */
@@ -152,8 +150,7 @@ static int virtio_dev_probe(struct device *_d)
 static int virtio_dev_remove(struct device *_d)
 {
         struct virtio_device *dev = dev_to_virtio(_d);
-        struct virtio_driver *drv = container_of(dev->dev.driver,
-                                                 struct virtio_driver, driver);
+        struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
 
         drv->remove(dev);