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pps: Simplify capture and event processing
Needs ReviewPublic

Authored by sebastian.huber_embedded-brains.de on Jul 26 2022, 8:14 AM.
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Details

Reviewers
phk
gnn
delphij
Summary

Use local variables for the captured timehand and timecounter in pps_event().
This fixes a potential issue in the nsec preparation for hardpps(). Here the
timecounter was accessed through the captured timehand after the generation was
checked.

Make a snapshot of the relevent timehand values early in pps_event(). Check
the timehand generation only once during the capture and event processing. Use
atomic_thread_fence_acq() similar to the other readers.

Diff Detail

Repository
rS FreeBSD src repository - subversion
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Build Status
Buildable 46577
Build 43466: arc lint + arc unit