From: Mark McLoughlin <markmc@redhat.com>
Date: Mon, 11 May 2009 17:11:44 +0000 (+0100)
Subject: virtio: teach virtio_has_feature() about transport features
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ee006b353f1ca8c9a8470b72b462beb011d62e32;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

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>
---

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);
 }