diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index f924280..cd7ef2f 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -483,7 +483,15 @@ mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
 		sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
 		pr_debug("CPU%d removed\n", cpu);
 		break;
-	case CPU_DEAD:
+
+	/*
+	 * Do not invalidate the microcode if a CPU goes offline,
+	 * because it would be impossible to get the microcode again
+	 * from userspace when the CPU comes back up, if the userspace
+	 * happens to be frozen at that moment by the freezer subsystem,
+	 * for example, due to a suspend operation in progress.
+	 */
+
 	case CPU_UP_CANCELED_FROZEN:
 		/* The CPU refused to come up during a system resume */
 		microcode_fini_cpu(cpu);