This is a note to let you know that I've just added the patch titled drm/msm: Set drvdata to NULL when msm_drm_init() fails to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-msm-set-drvdata-to-null-when-msm_drm_init-fails.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 583905845ade726283b32938c4d33d5c308174d1 Author: Stephen Boyd <swboyd@xxxxxxxxxxxx> Date: Thu Mar 25 14:28:22 2021 -0700 drm/msm: Set drvdata to NULL when msm_drm_init() fails [ Upstream commit 5620b135aea49a8f41c86aaecfcb1598a7774121 ] We should set the platform device's driver data to NULL here so that code doesn't assume the struct drm_device pointer is valid when it could have been destroyed. The lifetime of this pointer is managed by a kref but when msm_drm_init() fails we call drm_dev_put() on the pointer which will free the pointer's memory. This driver uses the component model, so there's sort of two "probes" in this file, one for the platform device i.e. msm_pdev_probe() and one for the component i.e. msm_drm_bind(). The msm_drm_bind() code is using the platform device's driver data to store struct drm_device so the two functions are intertwined. This relationship becomes a problem for msm_pdev_shutdown() when it tests the NULL-ness of the pointer to see if it should call drm_atomic_helper_shutdown(). The NULL test is a proxy check for if the pointer has been freed by kref_put(). If the drm_device has been destroyed, then we shouldn't call the shutdown helper, and we know that is the case if msm_drm_init() failed, therefore set the driver data to NULL so that this pointer liveness is tracked properly. Fixes: 9d5cbf5fe46e ("drm/msm: add shutdown support for display platform_driver") Cc: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> Cc: Fabio Estevam <festevam@xxxxxxxxx> Cc: Krishna Manikandan <mkrishn@xxxxxxxxxxxxxx> Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx> Message-Id: <20210325212822.3663144-1-swboyd@xxxxxxxxxxxx> Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 896d6f95a960..7443df77cadb 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -567,6 +567,7 @@ err_free_priv: kfree(priv); err_put_drm_dev: drm_dev_put(ddev); + platform_set_drvdata(pdev, NULL); return ret; }