virtio: teach virtio_has_feature() about transport features

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>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 4cd290c06a88..99f514575f6a 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -113,7 +113,9 @@ 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);
 }