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virtio/scsi: verify device has config space

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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>
This commit is contained in:
Michael S. Tsirkin 2015-01-12 16:23:37 +02:00 committed by Rusty Russell
parent 6ba422489b
commit 8cab3cd6ad
1 changed files with 6 additions and 0 deletions
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6
drivers/scsi/virtio_scsi.c
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@ -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;