[PATCH 01/12] efi: add function to determine type of device path

[Lucas Stach]

Thanks to the wonders of UEFI we have to walk down the
device path all the way until we arrive at the device
we got this path from...

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
---
 common/efi-devicepath.c | 15 +++++++++++++++
 include/efi.h           |  1 +
 2 files changed, 16 insertions(+)

diff --git a/common/efi-devicepath.c b/common/efi-devicepath.c
index 2b1d916768d0..a53c6d2e8b9b 100644
--- a/common/efi-devicepath.c
+++ b/common/efi-devicepath.c
@@ -1368,3 +1368,18 @@ char *device_path_to_str(struct efi_device_path *dev_path)
 
 	return str.str;
 }
+
+u8 device_path_to_type(struct efi_device_path *dev_path)
+{
+	struct efi_device_path *dev_path_next;
+
+	dev_path = unpack_device_path(dev_path);
+	dev_path_next = next_device_path_node(dev_path);
+
+	while (!is_device_path_end(dev_path_next)) {
+		dev_path = dev_path_next;
+		dev_path_next = next_device_path_node(dev_path);
+	}
+
+	return device_path_type(dev_path);
+}
diff --git a/include/efi.h b/include/efi.h
index 4ad9f69237e7..de51e1a3c9b6 100644
--- a/include/efi.h
+++ b/include/efi.h
@@ -615,6 +615,7 @@ static inline int efi_compare_guid(efi_guid_t *a, efi_guid_t *b)
 }
 
 char *device_path_to_str(struct efi_device_path *dev_path);
+u8 device_path_to_type(struct efi_device_path *dev_path);
 
 const char *efi_guid_string(efi_guid_t *g);
 
-- 
2.1.3