svn commit: r360464 - head/sys/kern

[Michal Meloun]

Author: mmel
Date: Wed Apr 29 14:14:15 2020
New Revision: 360464
URL: https://svnweb.freebsd.org/changeset/base/360464

Log:
  Don't try to set frequendcy for enumerated but newer started CPUs.
  
  Openfirmare enumerates and installs the driver for all processors,
  regardless of whether they will be started later (because of power
  constrains for example).
  
  MFC after: 3 weeks

Modified:
  head/sys/kern/kern_cpu.c

Modified: head/sys/kern/kern_cpu.c
==============================================================================
--- head/sys/kern/kern_cpu.c	Wed Apr 29 14:06:42 2020	(r360463)
+++ head/sys/kern/kern_cpu.c	Wed Apr 29 14:14:15 2020	(r360464)
@@ -325,6 +325,12 @@ cf_set_method(device_t dev, const struct cf_level *lev
 
 		/* Bind to the target CPU before switching. */
 		pc = cpu_get_pcpu(set->dev);
+
+		/* Skip settings if CPU is not started. */
+		if (pc == NULL) {
+			error = 0;
+			goto out;
+		}
 		thread_lock(curthread);
 		pri = curthread->td_priority;
 		sched_prio(curthread, PRI_MIN);