cbmem.h: Change return type of cbmem_get_region

The underlying IMD function already returns an integer which indicates
success or failure.

This removes the need to have initialized variables that need to be
checked for NULL later. In some cases this actually adds the appropriate
check for returned values.

Dying is appropriate if cbmem is not found as it is essential to the
bootflow.

Change-Id: Ib3e09a75380faf9f533601368993261f042422ef
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84039
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/src/lib/imd_cbmem.c b/src/lib/imd_cbmem.c
index a88cf98d6c..2fc54bfff7 100644
--- a/src/lib/imd_cbmem.c
+++ b/src/lib/imd_cbmem.c
@@ -193,16 +193,19 @@ void *cbmem_entry_start(const struct cbmem_entry *entry)
 
 void cbmem_add_bootmem(void)
 {
-	void *baseptr = NULL;
-	size_t size = 0;
+	void *baseptr;
+	size_t size;
 
-	cbmem_get_region(&baseptr, &size);
+	if (cbmem_get_region(&baseptr, &size)) {
+		printk(BIOS_ERR, "CBMEM pointer/size not found!\n");
+		return;
+	}
 	bootmem_add_range((uintptr_t)baseptr, size, BM_MEM_TABLE);
 }
 
-void cbmem_get_region(void **baseptr, size_t *size)
+int cbmem_get_region(void **baseptr, size_t *size)
 {
-	imd_region_used(&imd, baseptr, size);
+	return imd_region_used(&imd, baseptr, size);
 }
 
 #if ENV_PAYLOAD_LOADER || (CONFIG(EARLY_CBMEM_LIST) && ENV_HAS_CBMEM)