Author: mjg
Date: Sat Dec 31 12:47:41 2016
New Revision: 310964
URL: https://svnweb.freebsd.org/changeset/base/310964
Log:
MFC r303921:
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:
stable/11/sys/kern/kern_descrip.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/kern/kern_descrip.c
==============================================================================
--- stable/11/sys/kern/kern_descrip.c Sat Dec 31 12:41:42 2016
(r310963)
+++ stable/11/sys/kern/kern_descrip.c Sat Dec 31 12:47:41 2016
(r310964)
@@ -939,6 +939,8 @@ funsetown(struct sigio **sigiop)
{
struct sigio *sigio;
+ if (*sigiop == NULL)
+ return;
SIGIO_LOCK();
sigio = *sigiop;
if (sigio == NULL) {
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