Add more comments for efi_file_from_path().
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- lib/efi_loader/efi_file.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/lib/efi_loader/efi_file.c b/lib/efi_loader/efi_file.c index 9d709a8db0..1341f1b456 100644 --- a/lib/efi_loader/efi_file.c +++ b/lib/efi_loader/efi_file.c @@ -637,6 +637,12 @@ static const struct efi_file_handle efi_file_handle_protocol = { .flush = efi_file_flush, };
+/** + * efi_file_from_path() - open file via device path + * + * @fp: device path + * @return: EFI_FILE_PROTOCOL for the file or NULL + */ struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp) { struct efi_simple_file_system_protocol *v; @@ -651,10 +657,14 @@ struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp) if (ret != EFI_SUCCESS) return NULL;
- /* skip over device-path nodes before the file path: */ + /* Skip over device-path nodes before the file path. */ while (fp && !EFI_DP_TYPE(fp, MEDIA_DEVICE, FILE_PATH)) fp = efi_dp_next(fp);
+ /* + * Step through the nodes of the directory path until the actual file + * node is reached which is the final node in the device path. + */ while (fp) { struct efi_device_path_file_path *fdp = container_of(fp, struct efi_device_path_file_path, dp);