Author: mjg
Date: Wed Aug 10 15:24:15 2016
New Revision: 303921
URL: https://svnweb.freebsd.org/changeset/base/303921
Log:
sigio: do a lockless check in funsetownlist
There is no need to grab the lock first to see if sigio is used, and it
typically is not.
Modified:
head/sys/kern/kern_descrip.c
Modified: head/sys/kern/kern_descrip.c
==============================================================================
--- head/sys/kern/kern_descrip.c Wed Aug 10 15:16:28 2016
(r303920)
+++ head/sys/kern/kern_descrip.c Wed Aug 10 15:24:15 2016
(r303921)
@@ -942,6 +942,8 @@ funsetown(struct sigio **sigiop)
{
struct sigio *sigio;
+ if (*sigiop == NULL)
+ return;
SIGIO_LOCK();
sigio = *sigiop;
if (sigio == NULL) {
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