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[4/6] virtio/net: verify device has config space

Message ID 1421160167-18498-5-git-send-email-mst@redhat.com
State Not Applicable, archived
Delegated to: David Miller
Headers show

Commit Message

Michael S. Tsirkin Jan. 13, 2015, 2:43 p.m. UTC 
Some devices might not implement config space access
(e.g. remoteproc used not to - before 3.9).
virtio/net needs config space access so make it
fail gracefully if not there.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 drivers/net/virtio_net.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 5ca9771..9bc1072 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1713,6 +1713,12 @@  static int virtnet_probe(struct virtio_device *vdev)
 	struct virtnet_info *vi;
 	u16 max_queue_pairs;
 
+	if (!vdev->config->get) {
+		dev_err(&vdev->dev, "%s failure: config access disabled\n",
+			__func__);
+		return -EINVAL;
+	}
+
 	if (!virtnet_validate_features(vdev))
 		return -EINVAL;