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drm/vmwgfx: Fix KMS with 3D on HW version 10

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HW version 10 does not have GB Surfaces so there is no backing buffer for
surface backed FBs. This would result in a nullptr dereference and crash
the driver causing a black screen.

Fixes: 965544150d ("drm/vmwgfx: Refactor cursor handling")
Signed-off-by: Ian Forbes <ian.forbes@broadcom.com>
Reviewed-by: Zack Rusin <zack.rusin@broadcom.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://patch.msgid.link/20251114203703.1946616-1-ian.forbes@broadcom.com
This commit is contained in:
Ian Forbes
2025-11-14 14:37:03 -06:00
committed by Zack Rusin
parent 14adddc653
commit d9186faeae
1 changed files with 8 additions and 6 deletions
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14
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
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@@ -766,13 +766,15 @@ err_out:
return ERR_PTR(ret);
}
ttm_bo_reserve(&bo->tbo, false, false, NULL);
ret = vmw_bo_dirty_add(bo);
if (!ret && surface && surface->res.func->dirty_alloc) {
surface->res.coherent = true;
ret = surface->res.func->dirty_alloc(&surface->res);
if (bo) {
ttm_bo_reserve(&bo->tbo, false, false, NULL);
ret = vmw_bo_dirty_add(bo);
if (!ret && surface && surface->res.func->dirty_alloc) {
surface->res.coherent = true;
ret = surface->res.func->dirty_alloc(&surface->res);
}
ttm_bo_unreserve(&bo->tbo);
}
ttm_bo_unreserve(&bo->tbo);
return &vfb->base;
}