From: Michael S. Tsirkin <mst@redhat.com>
Date: Wed, 5 Aug 2020 13:17:38 +0000 (-0400)
Subject: virtio_config: add virtio_cread_le_feature
X-Git-Tag: v5.9-rc1~58^2~42
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=035ce4210be1257dd417785ff7818b5c0f2205fb;p=linux-block.git

virtio_config: add virtio_cread_le_feature

Mirrors virtio_cread_feature but for LE fields.

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

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 5b5196fec899..cc7a2b1fd7b2 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -555,4 +555,14 @@ static inline void virtio_cwrite64(struct virtio_device *vdev,
 		_r;							\
 	})
 
+/* Conditional config space accessors. */
+#define virtio_cread_le_feature(vdev, fbit, structname, member, ptr)	\
+	({								\
+		int _r = 0;						\
+		if (!virtio_has_feature(vdev, fbit))			\
+			_r = -ENOENT;					\
+		else							\
+			virtio_cread_le((vdev), structname, member, ptr); \
+		_r;							\
+	})
 #endif /* _LINUX_VIRTIO_CONFIG_H */