[PATCH 2/3] virtio_config: Add virtio_config_val_len()

Sasha Levin
Sun, 14 Aug 2011 14:52:32 -0000

This patch adds virtio_config_val_len() which allows retrieving variable
length data from the virtio config space only if a specific feature is on.

Cc: Amit Shah <amit.shah at redhat.com>
Cc: "Michael S. Tsirkin" <mst at redhat.com>
Cc: Rusty Russell <rusty at rustcorp.com.au>
Cc: virtualization at lists.linux-foundation.org
Signed-off-by: Sasha Levin <levinsasha928 at gmail.com>
---
 include/linux/virtio_config.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 39c88c5..add4790 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -155,6 +155,9 @@ static inline bool virtio_has_feature(const struct
virtio_device *vdev,
 #define virtio_config_val(vdev, fbit, offset, v) \
 	virtio_config_buf((vdev), (fbit), (offset), (v), sizeof(*v))

+#define virtio_config_val_len(vdev, fbit, offset, v, len) \
+	virtio_config_buf((vdev), (fbit), (offset), (v), (len))
+
 static inline int virtio_config_buf(struct virtio_device *vdev,
 				    unsigned int fbit,
 				    unsigned int offset,
--
1.7.6