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Restrict the memory barriers in bus_dmamap_sync to just the operations

Description

Restrict the memory barriers in bus_dmamap_sync to just the operations
where it's needed.

Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation

Details

Provenance
andrewAuthored on
Parents
rS299531: MFC r298977: Fix a memory leak introduced with the devctl intergration of
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