Author: glebius
Date: Fri Dec 9 19:07:31 2016
New Revision: 309751
URL: https://svnweb.freebsd.org/changeset/base/309751
Log:
Use acquire write to cr_lock to complement with release write at end
of locked region.
Submitted by: kib
Modified:
head/sys/kern/subr_counter.c
Modified: head/sys/kern/subr_counter.c
==============================================================================
--- head/sys/kern/subr_counter.c Fri Dec 9 18:55:27 2016
(r309750)
+++ head/sys/kern/subr_counter.c Fri Dec 9 19:07:31 2016
(r309751)
@@ -144,7 +144,7 @@ counter_ratecheck(struct counter_rate *c
* First try unlocked read, and then proceed with atomic.
*/
if ((cr->cr_lock == 0) &&
- atomic_cmpset_int(&cr->cr_lock, 0, 1)) {
+ atomic_cmpset_acq_int(&cr->cr_lock, 0, 1)) {
/*
* Check if other thread has just went through the
* reset sequence before us.
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