CVS commit: src/sys/external/bsd/drm2

["Maya Rashish" <maya%netbsd.org@localhost>]

Module Name:    src
Committed By:   maya
Date:           Thu Mar  9 08:27:18 UTC 2017

Modified Files:
        src/sys/external/bsd/drm2/dist/drm/ttm: ttm_tt.c
        src/sys/external/bsd/drm2/ttm: ttm_agp_backend.c ttm_bus_dma.c

Log Message:
Clarify ttm state transitions tt_unpopulated<->tt_unbound<->tt_bound.
Assert it, too, and don't handle other cases.

We can add the assertion to ttm_agp_tt_unpopulate because it is called by
{nouveau,radeon}_ttm_tt_unpopulate, which is generically called
ttm_tt_unpopulate.

And the sole caller to ttm_tt_unpopulate (ttm_tt_destroy) only does so if the
state is unbound. the other caller is in a !NetBSD block.

We can add the assertion to ttm_agp_tt_populate and avoid handling the
!unpopulated case because the sole callers are {nouveau,radeon}_ttm_tt_populate
both of which return early in the !unpopulated case.

We can change the assertion on ttm_tt_wire because it is solely called by
ttm_bus_dma_populate, which already asserts that it is the unpopulated case.

from riastradh


To generate a diff of this commit:
cvs rdiff -u -r1.8 -r1.9 src/sys/external/bsd/drm2/dist/drm/ttm/ttm_tt.c
cvs rdiff -u -r1.5 -r1.6 src/sys/external/bsd/drm2/ttm/ttm_agp_backend.c
cvs rdiff -u -r1.6 -r1.7 src/sys/external/bsd/drm2/ttm/ttm_bus_dma.c

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