We provide a UEFI driver for block devices. When ConnectController() is called for a handle with the EFI_BLOCK_IO_PROTOCOL this driver creates the partitions. When DisconnectController() is called the handles for the partitions have to be deleted. This requires that the child controllers (partitions) open the EFI_BLOCK_IO_PROTOCOL of the controller (block IO device) with attribute EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
Signed-off-by: Heinrich Schuchardt <[email protected]> --- lib/efi_loader/efi_disk.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c index 7bd1ccec45..496ef29dd8 100644 --- a/lib/efi_loader/efi_disk.c +++ b/lib/efi_loader/efi_disk.c @@ -376,6 +376,23 @@ static efi_status_t efi_disk_add_dev( /* Fill in object data */ if (part) { struct efi_device_path *node = efi_dp_part_node(desc, part); + struct efi_handler *handler; + void *protocol_interface; + + /* Parent must expose EFI_BLOCK_IO_PROTOCOL */ + ret = efi_search_protocol(parent, &efi_block_io_guid, &handler); + if (ret != EFI_SUCCESS) + goto error; + + /* + * Link the partition (child controller) to the block device + * (controller). + */ + ret = efi_protocol_open(handler, &protocol_interface, NULL, + &diskobj->header, + EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER); + if (ret != EFI_SUCCESS) + goto error; diskobj->dp = efi_dp_append_node(dp_parent, node); efi_free_pool(node); @@ -453,6 +470,9 @@ static efi_status_t efi_disk_add_dev( } } return EFI_SUCCESS; +error: + efi_delete_handle(&diskobj->header); + return ret; } /** -- 2.29.2
