Commit 8cab3cd6 authored Jan 12, 2015 by Michael S. Tsirkin Committed by Rusty Russell Jan 21, 2015

virtio/scsi: verify device has config space



Some devices might not implement config space access
(e.g. remoteproc used not to - before 3.9).
virtio/scsi needs config space access so make it
fail gracefully if not there.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

parent 6ba42248

drivers/scsi/virtio_scsi.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -950,6 +950,12 @@ static int virtscsi_probe(struct virtio_device *vdev)
		u32 num_queues;
		struct scsi_host_template *hostt;

		if (!vdev->config->get) {
		dev_err(&vdev->dev, "%s failure: config access disabled\n",
		__func__);
		return -EINVAL;
		}

		/* We need to know how many queues before we allocate. */
		num_queues = virtscsi_config_get(vdev, num_queues) ? : 1;