[PATCH 1/3] virtio: teach virtio_has_feature() about transport features

[Mark McLoughlin <markmc@redhat.com>]

Drivers don't add transport features to their table, so we
shouldn't check these with virtio_check_driver_offered_feature().

We could perhaps add an ->offered_feature() virtio_config_op,
but that perhaps that would be overkill for a consitency check
like this.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
---
 include/linux/virtio_config.h |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index bf8ec28..e4ba694 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -99,7 +99,9 @@ static inline bool virtio_has_feature(const struct virtio_device *vdev,
 	if (__builtin_constant_p(fbit))
 		BUILD_BUG_ON(fbit >= 32);
 
-	virtio_check_driver_offered_feature(vdev, fbit);
+	if (fbit < VIRTIO_TRANSPORT_F_START)
+		virtio_check_driver_offered_feature(vdev, fbit);
+
 	return test_bit(fbit, vdev->features);
 }
 
-- 
1.6.0.6