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