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 22918591fb747a6d16801e74a170cf98e886f83b ]
This driver is taking a kobject for mtk_mutex only once per mmsys device for each drm-mediatek driver instance, differently from the behavior with other components, but it is decrementing the kobj's refcount in a loop and once per mmsys: this is not right and will result in a refcount_t underflow warning when mediatek-drm returns multiple probe deferrals in one boot (or when manually bound and unbound).
Besides that, the refcount for mutex_dev was not decremented for error cases in mtk_drm_bind(), causing another refcount_t warning but this time for overflow, when the failure happens not during driver bind but during component bind.
In order to fix one of the reasons why this is happening, remove the put_device(xx->mutex_dev) loop from the mtk_drm_kms_init()'s put_mutex_dev label (and drop the label) and add a single call to correctly free the single incremented refcount of mutex_dev to the mtk_drm_unbind() function to fix the refcount_t underflow.
Moreover, add the same call to the error cases in mtk_drm_bind() to fix the refcount_t overflow.
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/20250403104741.71045-2-... 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 | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index 8b41a07c3641f..108cab35ce485 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -431,7 +431,7 @@ static int mtk_drm_kms_init(struct drm_device *drm)
ret = drmm_mode_config_init(drm); if (ret) - goto put_mutex_dev; + return ret;
drm->mode_config.min_width = 64; drm->mode_config.min_height = 64; @@ -450,7 +450,7 @@ static int mtk_drm_kms_init(struct drm_device *drm) drm->dev_private = private->all_drm_private[i]; ret = component_bind_all(private->all_drm_private[i]->dev, drm); if (ret) - goto put_mutex_dev; + return ret; }
/* @@ -532,9 +532,6 @@ static int mtk_drm_kms_init(struct drm_device *drm) err_component_unbind: for (i = 0; i < private->data->mmsys_dev_num; i++) component_unbind_all(private->all_drm_private[i]->dev, drm); -put_mutex_dev: - for (i = 0; i < private->data->mmsys_dev_num; i++) - put_device(private->all_drm_private[i]->mutex_dev);
return ret; } @@ -608,8 +605,10 @@ static int mtk_drm_bind(struct device *dev) return 0;
drm = drm_dev_alloc(&mtk_drm_driver, dev); - if (IS_ERR(drm)) - return PTR_ERR(drm); + if (IS_ERR(drm)) { + ret = PTR_ERR(drm); + goto err_put_dev; + }
private->drm_master = true; drm->dev_private = private; @@ -635,6 +634,8 @@ static int mtk_drm_bind(struct device *dev) drm_dev_put(drm); for (i = 0; i < private->data->mmsys_dev_num; i++) private->all_drm_private[i]->drm = NULL; +err_put_dev: + put_device(private->mutex_dev); return ret; }
@@ -647,6 +648,8 @@ static void mtk_drm_unbind(struct device *dev) drm_dev_unregister(private->drm); mtk_drm_kms_deinit(private->drm); drm_dev_put(private->drm); + + put_device(private->mutex_dev); } private->mtk_drm_bound = false; private->drm_master = false;