CVS commit: src/sys/external/bsd/drm2/dist/drm/radeon

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Mon Aug 27 13:56:22 UTC 2018

Modified Files:
        src/sys/external/bsd/drm2/dist/drm/radeon: radeon_gart.c

Log Message:
Fix ordering of bus_dmamap_sync.

The ordering is:

...
- driver writes to kernel pointer
- sync
- driver triggers device use of newly written data (*)
- sync
- driver writes to kernel pointer
- sync
...

The operation (*) is a DMA write.  Hence the syncs should be:

...
- driver writes to kernel pointer
- bus_dmamap_sync(BUS_DMASYNC_PREWRITE)
- driver triggers device use of newly written data
- bus_dmamap_sync(BUS_DMASYNC_POSTWRITE)
- bus_dmamap_sync(BUS_DMASYNC_PREWRITE)
- driver writes to kernel pointer
- bus_dmamap_sync(BUS_DMASYNC_POSTWRITE)
- bus_dmamap_sync(BUS_DMASYNC_PREWRITE)
...


To generate a diff of this commit:
cvs rdiff -u -r1.9 -r1.10 \
    src/sys/external/bsd/drm2/dist/drm/radeon/radeon_gart.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.