Merge tag 'efi-2020-01-rc2-2' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2021-01-rc2 (2)

The series contains the following enhancements

* preparatory patches for UEFI capsule updates
* initialization of the emulated RTC using an environment variable

and a bug fix

* If DisconnectController() is called for a child controller that is the
  only child of the driver, the driver must be disconnected.

4 files changed, 52 insertions, 8 deletions

diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index ab42f3ba75..075481428c 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -27,6 +27,10 @@ config EFI_LOADER
 
 if EFI_LOADER
 
+config EFI_SETUP_EARLY
+	bool
+	default n
+
 choice
 	prompt "Store for non-volatile UEFI variables"
 	default EFI_VARIABLE_FILE_STORE
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 9bad1d159b..8892fb01e1 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -34,6 +34,7 @@ obj-y += efi_memory.o
 obj-y += efi_root_node.o
 obj-y += efi_runtime.o
 obj-y += efi_setup.o
+obj-y += efi_string.o
 obj-$(CONFIG_EFI_UNICODE_COLLATION_PROTOCOL2) += efi_unicode_collation.o
 obj-y += efi_var_common.o
 obj-y += efi_var_mem.o
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index b26ac9fbfc..dfa71b1774 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -3523,6 +3523,7 @@ static efi_status_t EFIAPI efi_disconnect_controller(
 	size_t number_of_children = 0;
 	efi_status_t r;
 	struct efi_object *efiobj;
+	bool sole_child;
 
 	EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle,
 		  child_handle);
@@ -3545,16 +3546,18 @@ static efi_status_t EFIAPI efi_disconnect_controller(
 	}
 
 	/* Create list of child handles */
+	r = efi_get_child_controllers(efiobj,
+				      driver_image_handle,
+				      &number_of_children,
+				      &child_handle_buffer);
+	if (r != EFI_SUCCESS)
+		return r;
+	sole_child = (number_of_children == 1);
+
 	if (child_handle) {
 		number_of_children = 1;
+		free(child_handle_buffer);
 		child_handle_buffer = &child_handle;
-	} else {
-		r = efi_get_child_controllers(efiobj,
-					      driver_image_handle,
-					      &number_of_children,
-					      &child_handle_buffer);
-		if (r != EFI_SUCCESS)
-			return r;
 	}
 
 	/* Get the driver binding protocol */
@@ -3579,7 +3582,7 @@ static efi_status_t EFIAPI efi_disconnect_controller(
 		}
 	}
 	/* Remove the driver */
-	if (!child_handle) {
+	if (!child_handle || sole_child) {
 		r = EFI_CALL(binding_protocol->stop(binding_protocol,
 						    controller_handle,
 						    0, NULL));
diff --git a/lib/efi_loader/efi_string.c b/lib/efi_loader/efi_string.c
new file mode 100644
index 0000000000..3de721f06c
--- /dev/null
+++ b/lib/efi_loader/efi_string.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * String functions
+ *
+ * Copyright (c) 2020 AKASHI Takahiro, Linaro Limited
+ */
+
+#include <common.h>
+#include <charset.h>
+
+/**
+ * efi_create_indexed_name - create a string name with an index
+ * @buffer:	Buffer
+ * @name:	Name string
+ * @index:	Index
+ *
+ * Create a utf-16 string with @name, appending @index.
+ * For example, L"Capsule0001"
+ *
+ * The caller must ensure that the buffer has enough space for the resulting
+ * string including the trailing L'\0'.
+ *
+ * Return: A pointer to the next position after the created string
+ *	   in @buffer, or NULL otherwise
+ */
+u16 *efi_create_indexed_name(u16 *buffer, const char *name, unsigned int index)
+{
+	u16 *p = buffer;
+	char index_buf[5];
+
+	utf8_utf16_strcpy(&p, name);
+	sprintf(index_buf, "%04X", index);
+	utf8_utf16_strcpy(&p, index_buf);
+
+	return p;
+}