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cgem: improve usage of busdma(9) KPI
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Authored by mhorne on Feb 18 2021, 5:11 PM.
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Details

Summary

BUS_DMA_NOCACHE should only be used when one needs to guarantee the
created mapping has uncached memory attributes, usually as a result of buggy
hardware. Normal use cases should pass BUS_DMA_COHERENT, to create an
appropriate mapping based on the flags passed to bus_dma_tag_create().

This should have no functional change, since the DMA tags in this driver are
created without the BUS_DMA_COHERENT flag.

Reported by: mmel

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rS FreeBSD src repository - subversion
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Buildable 37162
Build 34051: arc lint + arc unit