diff options
Diffstat (limited to 'lib/efi_loader/efi_device_path.c')
| -rw-r--r-- | lib/efi_loader/efi_device_path.c | 33 |
1 files changed, 24 insertions, 9 deletions
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c index 50a988c..171661b 100644 --- a/lib/efi_loader/efi_device_path.c +++ b/lib/efi_loader/efi_device_path.c @@ -973,9 +973,22 @@ static void path_to_uefi(void *uefi, const char *src) *pos = 0; } -/* - * If desc is NULL, this creates a path with only the file component, - * otherwise it creates a full path with both device and file components +/** + * efi_dp_from_file() - create device path for file + * + * The function creates a device path from the block descriptor @desc and the + * partition number @part and appends a device path node created describing the + * file path @path. + * + * If @desc is NULL, the device path will not contain nodes describing the + * partition. + * If @path is an empty string "", the device path will not contain a node + * for the file path. + * + * @desc: block device descriptor or NULL + * @part: partition number + * @path: file path on partition or "" + * Return: device path or NULL in case of an error */ struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part, const char *path) @@ -1002,12 +1015,14 @@ struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part, buf = dp_part_fill(buf, desc, part); /* add file-path: */ - fp = buf; - fp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; - fp->dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH; - fp->dp.length = (u16)fpsize; - path_to_uefi(fp->str, path); - buf += fpsize; + if (*path) { + fp = buf; + fp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; + fp->dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH; + fp->dp.length = (u16)fpsize; + path_to_uefi(fp->str, path); + buf += fpsize; + } *((struct efi_device_path *)buf) = END; |