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In do_lock_pi(), do not override error from umtxq_sleep_pi() when

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doing suspend check.  This restores the pre-r251684 behaviour, to
retry once after the signal is detected.

PR:	kern/192918
Submitted by:	Elliott Rabe, Dell Inc., Eric van Gyzen <eric@vangyzen.net>
Obtained from:	Dell Inc.
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2014-08-22 18:42:14 +00:00
parent 1f9c1db5f5
commit fbb6eca60f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=270345
1 changed files with 4 additions and 2 deletions
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6
sys/kern/kern_umtx.c
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@ -1700,10 +1700,12 @@ do_lock_pi(struct thread *td, struct umutex *m, uint32_t flags,
* and we need to retry or we lost a race to the thread
* unlocking the umtx.
*/
if (old == owner)
if (old == owner) {
error = umtxq_sleep_pi(uq, pi, owner & ~UMUTEX_CONTESTED,
"umtxpi", timeout == NULL ? NULL : &timo);
else {
if (error != 0)
continue;
} else {
umtxq_unbusy(&uq->uq_key);
umtxq_unlock(&uq->uq_key);
}