nvme-pci: init shadow doorbell after each reset

The spec states:

  "The settings are not retained across a Controller Level Reset"

Therefore the driver must enable the shadow doorbell, after each reset.

This was caught while testing the nvme driver over upcoming nvme-mdev
device.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Minwoo Im <minwoo.im@samsung.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 3e4fb89..8ef3c67 100644 (file)
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2280,8 +2280,6 @@ static int nvme_dev_add(struct nvme_dev *dev)
                        return ret;
                }
                dev->ctrl.tagset = &dev->tagset;
-
-               nvme_dbbuf_set(dev);
        } else {
                blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1);
 
@@ -2289,6 +2287,7 @@ static int nvme_dev_add(struct nvme_dev *dev)
                nvme_free_queues(dev, dev->online_queues);
        }
 
+       nvme_dbbuf_set(dev);
        return 0;
 }