diff --git a/[refs] b/[refs]
index 87d715944f04..3f866edb1a1e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 95e3ec11491d0cbce9fcdf1cc17a527c114c7dcf
+refs/heads/master: 5c2a9f06a9cd7194f884cdc88144866235dec07d
diff --git a/trunk/drivers/idle/intel_idle.c b/trunk/drivers/idle/intel_idle.c
index 18f9ad814104..91aff180ac47 100644
--- a/trunk/drivers/idle/intel_idle.c
+++ b/trunk/drivers/idle/intel_idle.c
@@ -347,7 +347,8 @@ static int intel_idle_probe(void)
 	cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &mwait_substates);
 
 	if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) ||
-		!(ecx & CPUID5_ECX_INTERRUPT_BREAK))
+	    !(ecx & CPUID5_ECX_INTERRUPT_BREAK) ||
+	    !mwait_substates)
 			return -ENODEV;
 
 	pr_debug(PREFIX "MWAIT substates: 0x%x\n", mwait_substates);