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drm/ttm: Don't move non-existing data

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If ttm_bo_move_memcpy was instructed to move a non-populated ttm to
io memory, it would first populate the ttm, then move the data and then
destroy the ttm. That's stupid. However, some drivers might have relied on
this to clear io memory from old stuff. So instead of a NOP, which would
be the most efficient, just clear the destination.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
This commit is contained in:
Thomas Hellstrom 2013-11-17 23:30:38 -08:00
parent a3483353ca
commit 0bc254257b
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/ttm/ttm_bo_util.c
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@ -350,10 +350,13 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
goto out2;
/*
* Move nonexistent data. NOP.
* Don't move nonexistent data. Clear destination instead.
*/
if (old_iomap == NULL && ttm == NULL)
if (old_iomap == NULL &&
(ttm == NULL || ttm->state == tt_unpopulated)) {
memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
goto out2;
}
/*
* TTM might be null for moves within the same region.