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>
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@ -950,6 +950,12 @@ static int virtscsi_probe(struct virtio_device *vdev)
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u32 num_queues;
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struct scsi_host_template *hostt;
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if (!vdev->config->get) {
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dev_err(&vdev->dev, "%s failure: config access disabled\n",
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__func__);
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return -EINVAL;
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}
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/* We need to know how many queues before we allocate. */
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num_queues = virtscsi_config_get(vdev, num_queues) ? : 1;
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