drm/udl: add a release method and delay modeset teardown

commit 9b39b013037fbfa8d4b999345d9e904d8a336fc2 upstream.

If we unplug a udl device, the usb callback with deinit the
mode_config struct, however userspace will still have an open
file descriptor and a framebuffer on that device. When userspace
closes the fd, we'll oops because it'll try and look stuff up
in the object idr which we've destroyed.

This punts destroying the mode objects until release time instead.

Cc: stable@vger.kernel.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190405031715.5959-2-airlied@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c
index 31421b6b586e76f07b2721b5dfd23c0862cdb4fa..b45ac6bc8addbe9538fece0b44d7dd5a2311e7f3 100644 (file)
--- a/drivers/gpu/drm/udl/udl_drv.c
+++ b/drivers/gpu/drm/udl/udl_drv.c
@@ -47,6 +47,7 @@ static struct drm_driver driver = {
        .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
        .load = udl_driver_load,
        .unload = udl_driver_unload,
+       .release = udl_driver_release,
 
        /* gem hooks */
        .gem_free_object = udl_gem_free_object,

diff --git a/drivers/gpu/drm/udl/udl_drv.h b/drivers/gpu/drm/udl/udl_drv.h
index 2c149b841cf1edcc4e86032a73753ffefad53d25..307455dd65263b311f79dae1f15ec706436df671 100644 (file)
--- a/drivers/gpu/drm/udl/udl_drv.h
+++ b/drivers/gpu/drm/udl/udl_drv.h
@@ -101,6 +101,7 @@ void udl_urb_completion(struct urb *urb);
 
 int udl_driver_load(struct drm_device *dev, unsigned long flags);
 void udl_driver_unload(struct drm_device *dev);
+void udl_driver_release(struct drm_device *dev);
 
 int udl_fbdev_init(struct drm_device *dev);
 void udl_fbdev_cleanup(struct drm_device *dev);

diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
index f8ea3c99b523234273f705a3884a383df0949ae1..60866b422f81d2d9ae82cac37c60fba24ec6d758 100644 (file)
--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -378,6 +378,12 @@ void udl_driver_unload(struct drm_device *dev)
                udl_free_urb_list(dev);
 
        udl_fbdev_cleanup(dev);
-       udl_modeset_cleanup(dev);
        kfree(udl);
 }
+
+void udl_driver_release(struct drm_device *dev)
+{
+       udl_modeset_cleanup(dev);
+       drm_dev_fini(dev);
+       kfree(dev);
+}