Author: kib
Date: Thu Sep 1 07:20:50 2016
New Revision: 305184
URL: https://svnweb.freebsd.org/changeset/base/305184
Log:
MFC r304808:
Prevent leak of URWLOCK_READ_WAITERS flag for urwlocks.
PR: 211947
Modified:
stable/10/sys/kern/kern_umtx.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/kern/kern_umtx.c
==============================================================================
--- stable/10/sys/kern/kern_umtx.c Thu Sep 1 07:19:04 2016
(r305183)
+++ stable/10/sys/kern/kern_umtx.c Thu Sep 1 07:20:50 2016
(r305184)
@@ -2965,9 +2965,12 @@ sleep:
suword32(&rwlock->rw_blocked_readers, blocked_readers-1);
if (blocked_readers == 1) {
rv = fueword32(&rwlock->rw_state, &state);
- if (rv == -1)
+ if (rv == -1) {
+ umtxq_unbusy_unlocked(&uq->uq_key);
error = EFAULT;
- while (error == 0) {
+ break;
+ }
+ for (;;) {
rv = casueword32(&rwlock->rw_state, state,
&oldstate, state & ~URWLOCK_READ_WAITERS);
if (rv == -1) {
@@ -2978,6 +2981,8 @@ sleep:
break;
state = oldstate;
error = umtxq_check_susp(td);
+ if (error != 0)
+ break;
}
}
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