Messages in this thread Patch in this message | | | From | Jason Wang <> | Subject | [PATCH V2 2/2] virtio_pmem: set device ready in probe() | Date | Mon, 27 Jun 2022 14:29:41 +0800 |
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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 <pankaj.gupta@amd.com> Signed-off-by: Jason Wang <jasowang@redhat.com> --- 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
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