--- hwpstate.c.orig	2017-08-19 16:58:51.997734000 +0900
+++ hwpstate.c	2017-08-19 17:29:43.363170000 +0900
@@ -156,7 +156,6 @@
 static int
 hwpstate_goto_pstate(device_t dev, int pstate)
 {
-	int i;
 	uint64_t msr;
 	int j;
 	int limit;
@@ -169,26 +168,11 @@
 	if(limit > id)
 		id = limit;
 
-	/*
-	 * We are going to the same Px-state on all cpus.
-	 * Probably should take _PSD into account.
-	 */
 	error = 0;
-	CPU_FOREACH(i) {
-		/* Bind to each cpu. */
-		thread_lock(curthread);
-		sched_bind(curthread, i);
-		thread_unlock(curthread);
 		HWPSTATE_DEBUG(dev, "setting P%d-state on cpu%d\n",
 			id, PCPU_GET(cpuid));
 		/* Go To Px-state */
 		wrmsr(MSR_AMD_10H_11H_CONTROL, id);
-	}
-	CPU_FOREACH(i) {
-		/* Bind to each cpu. */
-		thread_lock(curthread);
-		sched_bind(curthread, i);
-		thread_unlock(curthread);
 		/* wait loop (100*100 usec is enough ?) */
 		for(j = 0; j < 100; j++){
 			/* get the result. not assure msr=id */
@@ -204,10 +188,6 @@
 			HWPSTATE_DEBUG(dev, "error: loop is not enough.\n");
 			error = ENXIO;
 		}
-	}
-	thread_lock(curthread);
-	sched_unbind(curthread);
-	thread_unlock(curthread);
 	return (error);
 }
 
@@ -323,13 +303,6 @@
 	uint64_t msr;
 	int error, type;
 
-	/*
-	 * Only hwpstate0.
-	 * It goes well with acpi_throttle.
-	 */
-	if (device_get_unit(dev) != 0)
-		return (ENXIO);
-
 	sc = device_get_softc(dev);
 	sc->dev = dev;