From 95288b1e94dbc0af9be969d12e82bf593dfb9044 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Mon, 4 Feb 2019 21:24:35 +0100 Subject: [PATCH] efi_loader: comments for efi_file_from_path() Add more comments for efi_file_from_path(). Signed-off-by: Heinrich Schuchardt --- 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 4b4422205d..3a7323765b 100644 --- a/lib/efi_loader/efi_file.c +++ b/lib/efi_loader/efi_file.c @@ -641,6 +641,12 @@ 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; @@ -655,10 +661,14 @@ 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); -- 2.39.5