Date: Sat, 31 Dec 2016 12:47:41 +0000 (UTC) From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r310964 - stable/11/sys/kern Message-ID: <201612311247.uBVClfZZ084294@repo.freebsd.org>
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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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