@@ -676,6 +676,10 @@ static int mtk_drm_bind(struct device *dev)
for (i = 0; i < private->data->mmsys_dev_num; i++)
private->all_drm_private[i]->drm = NULL;
err_put_dev:
+ for (i = 0; i < private->data->mmsys_dev_num; i++) {
+ /* For device_find_child in mtk_drm_get_all_priv() */
+ put_device(private->all_drm_private[i]->dev);
+ }
put_device(private->mutex_dev);
return ret;
}
@@ -683,6 +687,7 @@ static int mtk_drm_bind(struct device *dev)
static void mtk_drm_unbind(struct device *dev)
{
struct mtk_drm_private *private = dev_get_drvdata(dev);
+ int i;
/* for multi mmsys dev, unregister drm dev in mmsys master */
if (private->drm_master) {
@@ -690,6 +695,10 @@ static void mtk_drm_unbind(struct device *dev)
mtk_drm_kms_deinit(private->drm);
drm_dev_put(private->drm);
+ for (i = 0; i < private->data->mmsys_dev_num; i++) {
+ /* For device_find_child in mtk_drm_get_all_priv() */
+ put_device(private->all_drm_private[i]->dev);
+ }
put_device(private->mutex_dev);
}
private->mtk_drm_bound = false;
In function mtk_drm_get_all_drm_priv(), this driver is incrementing the refcount for the sub-drivers of mediatek-drm with a call to device_find_child() when taking a reference to all of those child devices. When the component bind fails multiple times this results in a refcount_t overflow, as the reference count is never decremented: fix that by adding a call to put_device() for all of the mmsys devices in a loop, in error cases of mtk_drm_bind() and in the mtk_drm_unbind() callback. Fixes: 1ef7ed48356c ("drm/mediatek: Modify mediatek-drm for mt8195 multi mmsys support") Reviewed-by: Chen-Yu Tsai <wenst@chromium.org> Link: https://lore.kernel.org/r/20250402083628.20111-3-angelogioacchino.delregno@collabora.com Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> --- drivers/gpu/drm/mediatek/mtk_drm_drv.c | 9 +++++++++ 1 file changed, 9 insertions(+)