The NVDIMM region could be available before the virtio_device_ready()
that is called by virtio_dev_probe(). This means the driver tries to
use device before DRIVER_OK which violates the spec, fixing this by
set device ready before the nvdimm_pmem_region_create().
Note that this means the virtio_pmem_host_ack() could be triggered
before the creation of the nd region, this is safe since the
virtio_pmem_host_ack() since pmem_lock has been initialized and
whether or not any available buffer is added before is validated.
Fixes 6e84200c0a29 ("virtio-pmem: Add virtio pmem driver")
Acked-by: Pankaj Gupta <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
---
Changes since v1:
- Remove some comments per Dan
---
drivers/nvdimm/virtio_pmem.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/nvdimm/virtio_pmem.c b/drivers/nvdimm/virtio_pmem.c
index 48f8327d0431..20da455d2ef6 100644
--- a/drivers/nvdimm/virtio_pmem.c
+++ b/drivers/nvdimm/virtio_pmem.c
@@ -84,6 +84,12 @@ static int virtio_pmem_probe(struct virtio_device *vdev)
ndr_desc.provider_data = vdev;
set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
set_bit(ND_REGION_ASYNC, &ndr_desc.flags);
+ /*
+ * The NVDIMM region could be available before the
+ * virtio_device_ready() that is called by
+ * virtio_dev_probe(), so we set device ready here.
+ */
+ virtio_device_ready(vdev);
nd_region = nvdimm_pmem_region_create(vpmem->nvdimm_bus, &ndr_desc);
if (!nd_region) {
dev_err(&vdev->dev, "failed to create nvdimm region\n");
@@ -92,6 +98,7 @@ static int virtio_pmem_probe(struct virtio_device *vdev)
}
return 0;
out_nd:
+ virtio_reset_device(vdev);
nvdimm_bus_unregister(vpmem->nvdimm_bus);
out_vq:
vdev->config->del_vqs(vdev);
--
2.25.1
