Add more comments for efi_file_from_path().
Signed-off-by: Heinrich Schuchardt <[email protected]>
---
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);
--
2.20.1
_______________________________________________
U-Boot mailing list
[email protected]
https://lists.denx.de/listinfo/u-boot
