sfxge(4): add missing barrier in common code MCDI response handling
The semantics of the MCDI interfacve require reading the first dword of the header before any other data in the buffer. Add a barrier to the common code MCDI handler to enforce this. Submitted by: Andy Moreton <amoreton at solarflare.com> Reviewed by: gnn Sponsored by: Solarflare Communications, Inc. MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D8949
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@ -159,6 +159,8 @@ ef10_mcdi_poll_response(
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efx_dword_t hdr;
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EFSYS_MEM_READD(esmp, 0, &hdr);
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EFSYS_MEM_READ_BARRIER();
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return (EFX_DWORD_FIELD(hdr, MCDI_HEADER_RESPONSE) ? B_TRUE : B_FALSE);
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}
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