diff options
| author | Konstantin Belousov <kib@FreeBSD.org> | 2017-12-19 10:05:45 +0000 |
|---|---|---|
| committer | Moyano, Gabriel <gabriel.moyano@dlr.de> | 2021-11-16 09:48:22 +0100 |
| commit | 7d3712fb26fe2cc7da71492f75b4f3cac6c996ec (patch) | |
| tree | b258f9f338fbcb068d8836fe612728ebd2cf2e76 | |
| parent | SPDX: use the Beerware identifier. (diff) | |
| download | rtems-7d3712fb26fe2cc7da71492f75b4f3cac6c996ec.tar.bz2 | |
Use atomic_load(9) to read ppsinfo sequence numbers.
In this case volatile qualifiers enusre that a compiler does not
optimize the accesses out.
Reviewed by: alc, jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D13534
| -rw-r--r-- | cpukit/score/src/kern_tc.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/cpukit/score/src/kern_tc.c b/cpukit/score/src/kern_tc.c index b17327a2f8..9e6602e478 100644 --- a/cpukit/score/src/kern_tc.c +++ b/cpukit/score/src/kern_tc.c @@ -1799,10 +1799,10 @@ pps_fetch(struct pps_fetch_args *fapi, struct pps_state *pps) tv.tv_usec = fapi->timeout.tv_nsec / 1000; timo = tvtohz(&tv); } - aseq = pps->ppsinfo.assert_sequence; - cseq = pps->ppsinfo.clear_sequence; - while (aseq == pps->ppsinfo.assert_sequence && - cseq == pps->ppsinfo.clear_sequence) { + aseq = atomic_load_int(&pps->ppsinfo.assert_sequence); + cseq = atomic_load_int(&pps->ppsinfo.clear_sequence); + while (aseq == atomic_load_int(&pps->ppsinfo.assert_sequence) && + cseq == atomic_load_int(&pps->ppsinfo.clear_sequence)) { if (abi_aware(pps, 1) && pps->driver_mtx != NULL) { if (pps->flags & PPSFLAG_MTX_SPIN) { err = msleep_spin(pps, pps->driver_mtx, |