virtio_config: fix virtio_cread_bytes

virtio_cread_bytes is implemented incorrectly in case length happens to
be 2,4 or 8 bytes: transports and devices will assume it's an integer
value that has to be converted to LE format.

Let's just do multiple 1-byte reads: this also makes life easier
for transports who only need to implement 1,2,4 and 8 byte reads.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 7979f850e7ac..a61cd37f088c 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -305,7 +305,10 @@ static inline void virtio_cread_bytes(struct virtio_device *vdev,
                                       unsigned int offset,
                                       void *buf, size_t len)
 {
-        vdev->config->get(vdev, offset, buf, len);
+        int i;
+
+        for (i = 0; i < len; i++)
+                vdev->config->get(vdev, offset + i, buf + i, 1);
 }
 
 static inline void virtio_cwrite8(struct virtio_device *vdev,