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IFLIB: do not remove dmamap on buffer unload
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Authored by shurd on Jan 26 2018, 6:35 PM.
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Details

Summary

Dmamap is created only on IFC attach. If we remove it on
buffer release, we won't be able to do ifconfig down&up. Only destroy
when in detach.

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rS FreeBSD src repository - subversion
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