efi_loader: correcty determine total device path length

Device paths may consist of multiple instances. Up to now we have only
considered the size of the first instance. For the services of the
EFI_DEVICE_PATH_UTILITIES_PROTOCOL in most cases the total length of the
device path is relevant.

So let's rename efi_dp_size() to efi_dp_instance_size() and create a new
function efi_dp_size() that calculates the total device path length.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/efi_loader.h b/include/efi_loader.h
index 0358bcb1d7..1298b5e160 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -324,7 +324,10 @@ int efi_dp_match(const struct efi_device_path *a,
 		 const struct efi_device_path *b);
 struct efi_object *efi_dp_find_obj(struct efi_device_path *dp,
 				   struct efi_device_path **rem);
-unsigned efi_dp_size(const struct efi_device_path *dp);
+/* get size of the first device path instance excluding end node */
+efi_uintn_t efi_dp_instance_size(const struct efi_device_path *dp);
+/* size of multi-instance device path excluding end node */
+efi_uintn_t efi_dp_size(const struct efi_device_path *dp);
 struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp);
 struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1,
 				      const struct efi_device_path *dp2);