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MFC r301292: When negotiating MSIX parameters, give other head time to see

Description

MFC r301292: When negotiating MSIX parameters, give other head time to see
our NTB_MSIX_RECEIVED status, before making upper layers overwrite it.

This is not completely perfect, but now it works better then before.

Sponsored by: iXsystems, Inc.

Details

Provenance
mavAuthored on
Parents
rS301902: MFC r300610: Re-enable write combining, disabled by default at r295486.
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