[RFC 1/1] efi_loader: fix open protocol information for block device

[Heinrich Schuchardt]

If OpenProtocol() is called without an agent handle, no open protocol
information is generated. With the patch we actually see the link between
partition an its block device when printing the open protocol information:

  000000001b2452f0 (host0)
    protocol: 964e5b21-6459-11d2-8e39-00a0c969723b - Block IO
      AgentHandle - 000000001b027eb0 - /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)
      ControllerHandle - 000000001b245460 (host0:1)
      Attributes - EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
      OpenCount - 1

Fixes: 264485131c59 ("efi_loader: link partition to block device")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
The EFI/DM integration needs some rework. In future efi_disk_add_dev() will
have to use a real driver handle as agent handle.

So this change is more for demonstration than actually required now.
---
 lib/efi_loader/efi_disk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index 39ea1a68a6..5f1717eda4 100644
--- a/lib/efi_loader/efi_disk.c
+++ b/lib/efi_loader/efi_disk.c
@@ -424,7 +424,7 @@ static efi_status_t efi_disk_add_dev(
 		 * Link the partition (child controller) to the block device
 		 * (controller).
 		 */
-		ret = efi_protocol_open(handler, &protocol_interface, NULL,
+		ret = efi_protocol_open(handler, &protocol_interface, efi_root,
 					&diskobj->header,
 					EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER);
 		if (ret != EFI_SUCCESS)
-- 
2.37.2