x86, microcode, AMD: Add a vendor-specific exit function

This will be used to do cleanup work before the driver exits.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

2 files changed, 9 insertions, 0 deletions

diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index d494799aafcd..e8a68c2a4364 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -353,3 +353,7 @@ struct microcode_ops * __init init_amd_microcode(void)
 {
 	return &microcode_amd_ops;
 }
+
+void __exit exit_amd_microcode(void)
+{
+}
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index 9d46f5e43b51..9302e2d0eb4b 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -563,6 +563,8 @@ module_init(microcode_init);
 
 static void __exit microcode_exit(void)
 {
+	struct cpuinfo_x86 *c = &cpu_data(0);
+
 	microcode_dev_exit();
 
 	unregister_hotcpu_notifier(&mc_cpu_notifier);
@@ -580,6 +582,9 @@ static void __exit microcode_exit(void)
 
 	microcode_ops = NULL;
 
+	if (c->x86_vendor == X86_VENDOR_AMD)
+		exit_amd_microcode();
+
 	pr_info("Microcode Update Driver: v" MICROCODE_VERSION " removed.\n");
 }
 module_exit(microcode_exit);