efi_loader: Add an EFI_CALL() macro

Rather than open-coding EFI_EXIT() + callback + EFI_ENTRY(), introduce
an EFI_CALL() macro.  This makes callbacks into UEFI world (of which
there will be more in the future) more concise and easier to locate in
the code.
Signed-off-by: NRob Clark <robdclark@gmail.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

include/efi_loader.h

@@ -15,17 +15,34 @@
 
 #include <linux/list.h>
 
+/*
+ * Enter the u-boot world from UEFI:
+ */
 #define EFI_ENTRY(format, ...) do { \
 	efi_restore_gd(); \
 	debug("EFI: Entry %s(" format ")\n", __func__, ##__VA_ARGS__); \
 	} while(0)
 
+/*
+ * Exit the u-boot world back to UEFI:
+ */
 #define EFI_EXIT(ret) ({ \
 	efi_status_t _r = ret; \
 	debug("EFI: Exit: %s: %u\n", __func__, (u32)(_r & ~EFI_ERROR_MASK)); \
 	efi_exit_func(_r); \
 	})
 
+/*
+ * Callback into UEFI world from u-boot:
+ */
+#define EFI_CALL(exp) do { \
+	debug("EFI: Call: %s\n", #exp); \
+	efi_exit_func(EFI_SUCCESS); \
+	exp; \
+	efi_restore_gd(); \
+	debug("EFI: Return From: %s\n", #exp); \
+	} while(0)
+
 extern struct efi_runtime_services efi_runtime_services;
 extern struct efi_system_table systab;
 

lib/efi_loader/efi_boottime.c

@@ -120,9 +120,7 @@ void efi_signal_event(struct efi_event *event)
 		return;
 	event->signaled = 1;
 	if (event->type & EVT_NOTIFY_SIGNAL) {
-		EFI_EXIT(EFI_SUCCESS);
-		event->notify_function(event, event->notify_context);
-		EFI_ENTRY("returning from notification function");
+		EFI_CALL(event->notify_function(event, event->notify_context));
 	}
 }