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
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=326973
@ -1601,10 +1601,10 @@ pps_fetch(struct pps_fetch_args *fapi, struct pps_state *pps)
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tv.tv_usec = fapi->timeout.tv_nsec / 1000;
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timo = tvtohz(&tv);
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}
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aseq = pps->ppsinfo.assert_sequence;
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cseq = pps->ppsinfo.clear_sequence;
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while (aseq == pps->ppsinfo.assert_sequence &&
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cseq == pps->ppsinfo.clear_sequence) {
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aseq = atomic_load_int(&pps->ppsinfo.assert_sequence);
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cseq = atomic_load_int(&pps->ppsinfo.clear_sequence);
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while (aseq == atomic_load_int(&pps->ppsinfo.assert_sequence) &&
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cseq == atomic_load_int(&pps->ppsinfo.clear_sequence)) {
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if (abi_aware(pps, 1) && pps->driver_mtx != NULL) {
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if (pps->flags & PPSFLAG_MTX_SPIN) {
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err = msleep_spin(pps, pps->driver_mtx,
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