Some devices might not implement config space access
(e.g. remoteproc used not to - before 3.9).
virtio/blk needs config space access so make it
fail gracefully if not there.
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
drivers/block/virtio_blk.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 7ef7c09..7164da8 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -575,6 +575,12 @@ static int virtblk_probe(struct virtio_device *vdev)
u16 min_io_size;
u8 physical_block_exp, alignment_offset;
+ if (!vdev->config->get) {
+ dev_err(&vdev->dev, "%s failure: config access disabled\n",
+ __func__);
+ return -EINVAL;
+ }
+
err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
GFP_KERNEL);
if (err < 0)
--
MST
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