From: Thomas Hellstrom thellstrom@vmware.com
commit 8407f8a1d940fe28c4243ad4f0cb6a44dcee88f6 upstream.
User-space handles equal to zero are interpreted as uninitialized or illegal by some drm systems (most notably kms). This means that a dumb buffer or surface with a zero user-space handle can never be used as a kms frame-buffer.
Cc: stable@vger.kernel.org Fixes: c7eae62666ad ("drm/vmwgfx: Make the object handles idr-generated") Signed-off-by: Thomas Hellstrom thellstrom@vmware.com Reviewed-by: Deepak Rawat drawat@vmware.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/vmwgfx/ttm_object.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/vmwgfx/ttm_object.c +++ b/drivers/gpu/drm/vmwgfx/ttm_object.c @@ -174,7 +174,7 @@ int ttm_base_object_init(struct ttm_obje kref_init(&base->refcount); idr_preload(GFP_KERNEL); spin_lock(&tdev->object_lock); - ret = idr_alloc(&tdev->idr, base, 0, 0, GFP_NOWAIT); + ret = idr_alloc(&tdev->idr, base, 1, 0, GFP_NOWAIT); spin_unlock(&tdev->object_lock); idr_preload_end(); if (ret < 0)