6.6-stable review patch. If anyone has any objections, please let me know.
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From: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com
[ Upstream commit 94c933716567084bfb9e79dcd81eb2b2308e84e1 ]
When calling component_bind_all(), if a component that is included in the list fails, all of those that have been successfully bound will be unbound, but this driver has two components lists for two actual devices, as in, each mmsys instance has its own components list.
In case mmsys0 (or actually vdosys0) is able to bind all of its components, but the secondary one fails, all of the components of the first are kept bound, while the ones of mmsys1/vdosys1 are correctly cleaned up.
This is not right because, in case of a failure, the components are re-bound for all of the mmsys/vdosys instances without caring about the ones that were previously left in a bound state.
Fix that by calling component_unbind_all() on all of the previous component masters that succeeded binding all subdevices when any of the other masters errors out.
Fixes: 1ef7ed48356c ("drm/mediatek: Modify mediatek-drm for mt8195 multi mmsys support") Reviewed-by: Chen-Yu Tsai wenst@chromium.org Signed-off-by: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com Link: https://patchwork.kernel.org/project/dri-devel/patch/20250403104741.71045-4-... Signed-off-by: Chun-Kuang Hu chunkuang.hu@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/mediatek/mtk_drm_drv.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index 32d66fa75b7c4..ef4fa70119de1 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -449,8 +449,11 @@ static int mtk_drm_kms_init(struct drm_device *drm) for (i = 0; i < private->data->mmsys_dev_num; i++) { drm->dev_private = private->all_drm_private[i]; ret = component_bind_all(private->all_drm_private[i]->dev, drm); - if (ret) + if (ret) { + while (--i >= 0) + component_unbind_all(private->all_drm_private[i]->dev, drm); return ret; + } }
/*