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sigio: do a lockless check in funsetownlist

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There is no need to grab the lock first to see if sigio is used, and it
typically is not.
This commit is contained in:
Mateusz Guzik 2016-08-10 15:24:15 +00:00
parent 5f521d7ba7
commit 382172be68
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=303921
1 changed files with 2 additions and 0 deletions
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sys/kern/kern_descrip.c
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@ -942,6 +942,8 @@ funsetown(struct sigio **sigiop)
{
struct sigio *sigio;
if (*sigiop == NULL)
return;
SIGIO_LOCK();
sigio = *sigiop;
if (sigio == NULL) {