efi_loader: exit status for efi_reset_system_init

efi_reset_system_init provides the architecture or board specific
initialization of the EFI subsystem. Errors should be caught and
signalled by a return code.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

arch/arm/cpu/armv8/fsl-layerscape/cpu.c

@@ -654,9 +654,9 @@ void __efi_runtime EFIAPI efi_reset_system(
 	while (1) { }
 }
 
-void efi_reset_system_init(void)
+efi_status_t efi_reset_system_init(void)
 {
-       efi_add_runtime_mmio(&rstcr, sizeof(*rstcr));
+	return efi_add_runtime_mmio(&rstcr, sizeof(*rstcr));
 }
 
 #endif

arch/arm/mach-bcm283x/reset.c

@@ -82,9 +82,9 @@ void __efi_runtime EFIAPI efi_reset_system(
 	while (1) { }
 }
 
-void efi_reset_system_init(void)
+efi_status_t efi_reset_system_init(void)
 {
-	efi_add_runtime_mmio(&wdog_regs, sizeof(*wdog_regs));
+	return efi_add_runtime_mmio(&wdog_regs, sizeof(*wdog_regs));
 }
 
 #endif

include/efi_loader.h

@@ -350,7 +350,7 @@ static inline int guidcmp(const efi_guid_t *g1, const efi_guid_t *g2)
 
 /* Call this with mmio_ptr as the _pointer_ to a pointer to an MMIO region
  * to make it available at runtime */
-void efi_add_runtime_mmio(void *mmio_ptr, u64 len);
+efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len);
 
 /* Boards may provide the functions below to implement RTS functionality */
 
@@ -358,7 +358,9 @@ void __efi_runtime EFIAPI efi_reset_system(
 			enum efi_reset_type reset_type,
 			efi_status_t reset_status,
 			unsigned long data_size, void *reset_data);
-void efi_reset_system_init(void);
+
+/* Architecture specific initialization of the EFI subsystem */
+efi_status_t efi_reset_system_init(void);
 
 efi_status_t __efi_runtime EFIAPI efi_get_time(
 			struct efi_time *time,
@@ -392,7 +394,10 @@ void *efi_bootmgr_load(struct efi_device_path **device_path,
 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
 #define __efi_runtime_data
 #define __efi_runtime
-static inline void efi_add_runtime_mmio(void *mmio_ptr, u64 len) { }
+static inline efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
+{
+	return EFI_SUCCESS;
+}
 
 /* No loader configured, stub out EFI_ENTRY */
 static inline void efi_restore_gd(void) { }

lib/efi_loader/efi_runtime.c

@@ -134,8 +134,9 @@ void __weak __efi_runtime EFIAPI efi_reset_system(
 	while (1) { }
 }
 
-void __weak efi_reset_system_init(void)
+efi_status_t __weak efi_reset_system_init(void)
 {
+	return EFI_SUCCESS;
 }
 
 efi_status_t __weak __efi_runtime EFIAPI efi_get_time(
@@ -332,18 +333,26 @@ static efi_status_t EFIAPI efi_set_virtual_address_map(
 	return EFI_EXIT(EFI_INVALID_PARAMETER);
 }
 
-void efi_add_runtime_mmio(void *mmio_ptr, u64 len)
+efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
 {
 	struct efi_runtime_mmio_list *newmmio;
+	efi_status_t ret;
 
 	u64 pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
-	efi_add_memory_map(*(uintptr_t *)mmio_ptr, pages, EFI_MMAP_IO, false);
+	ret = efi_add_memory_map(*(uintptr_t *)mmio_ptr, pages, EFI_MMAP_IO,
+				 false);
+	if (ret != EFI_SUCCESS)
+		return ret;
 
 	newmmio = calloc(1, sizeof(*newmmio));
+	if (!newmmio)
+		return EFI_OUT_OF_RESOURCES;
 	newmmio->ptr = mmio_ptr;
 	newmmio->paddr = *(uintptr_t *)mmio_ptr;
 	newmmio->len = len;
 	list_add_tail(&newmmio->link, &efi_runtime_mmio);
+
+	return ret;
 }
 
 /*