linux-kernel - [PATCH v3 28/38] virtio_config: add virtio_cread_le

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Date:   Wed, 5 Aug 2020 09:44:31 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH v3 28/38] virtio_config: add virtio_cread_le_feature

Mirrors virtio_cread_feature but for LE fields.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 include/linux/virtio_config.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

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 */
-- 
MST