linux-kernel - [PATCH 2/3] virtio_config: fix virtio_cread

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Date:	Thu, 11 Dec 2014 19:01:34 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	cornelia.huck@...ibm.com, Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.or,
	virtualization@...ts.linux-foundation.org
Subject: [PATCH 2/3] virtio_config: fix virtio_cread_bytes

virtio_cread_bytes is implemented incorrectly in case length happens to
be 2,4 or 8 bytes: transports and devices will assume it's an integer
value that has to be converted to LE format.

Let's just do multiple 1-byte reads: this also makes life easier
for transports who only need to implement 1,2,4 and 8 byte reads.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 include/linux/virtio_config.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 7979f85..a61cd37 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -305,7 +305,10 @@ static inline void virtio_cread_bytes(struct virtio_device *vdev,
 				      unsigned int offset,
 				      void *buf, size_t len)
 {
-	vdev->config->get(vdev, offset, buf, len);
+	int i;
+
+	for (i = 0; i < len; i++)
+		vdev->config->get(vdev, offset + i, buf + i, 1);
 }
 
 static inline void virtio_cwrite8(struct virtio_device *vdev,
-- 
MST

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