[S] Change in coreboot[master]: cpu/x86/mp_init.c: Improve AP entry point

[Arthur Heymans (Code Review)]

Arthur Heymans has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/70011 )

Change subject: cpu/x86/mp_init.c: Improve AP entry point
......................................................................

cpu/x86/mp_init.c: Improve AP entry point

Make sure that a pointer exists before dereferencing it.

Change-Id: I1a9833bb9686451224249efe599346f64dc37874
Signed-off-by: Arthur Heymans 
---
M src/cpu/x86/mp_init.c
1 file changed, 22 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/11/70011/1

diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c
index 758550c..5c89ff3 100644
--- a/src/cpu/x86/mp_init.c
+++ b/src/cpu/x86/mp_init.c
@@ -182,9 +182,16 @@
    enable_lapic();
    setup_lapic_interrupts();

-	struct device *dev = g_cpu_bus->children;
-	for (unsigned int i = index; i > 0; i--)
-		dev = dev->sibling;
+	struct device *dev;
+	int i = 0;
+	for (dev = g_cpu_bus->children; dev; dev = dev->sibling)
+		if (i++ == index)
+			break;
+
+	if (!dev) {
+		printk(BIOS_ERR, "Could not find allocated device for index %u\n", index);
+		return;
+	}

set_cpu_info(index, dev);