[PATCH 1/2] drm/gud: Free buffers on device removal

["Noralf Trønnes" <noralf@tronnes.org>]

Free transfer and compression buffers on device removal instead of at
DRM device removal time. This ensures that the usual 2x8MB buffers are
released when the device is unplugged and not kept around should
userspace keep the DRM device fd open.

At least Ubuntu 20.04 doesn't release the DRM device on unplug.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
 drivers/gpu/drm/gud/gud_drv.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/gud/gud_drv.c b/drivers/gpu/drm/gud/gud_drv.c
index e8b672dc9832..820c7331b3b3 100644
--- a/drivers/gpu/drm/gud/gud_drv.c
+++ b/drivers/gpu/drm/gud/gud_drv.c
@@ -394,12 +394,14 @@ static const struct drm_driver gud_drm_driver = {
 	.minor			= 0,
 };
 
-static void gud_free_buffers_and_mutex(struct drm_device *drm, void *unused)
+static void gud_free_buffers_and_mutex(void *data)
 {
-	struct gud_device *gdrm = to_gud_device(drm);
+	struct gud_device *gdrm = data;
 
 	vfree(gdrm->compress_buf);
+	gdrm->compress_buf = NULL;
 	kfree(gdrm->bulk_buf);
+	gdrm->bulk_buf = NULL;
 	mutex_destroy(&gdrm->ctrl_lock);
 	mutex_destroy(&gdrm->damage_lock);
 }
@@ -455,7 +457,7 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	INIT_WORK(&gdrm->work, gud_flush_work);
 	gud_clear_damage(gdrm);
 
-	ret = drmm_add_action_or_reset(drm, gud_free_buffers_and_mutex, NULL);
+	ret = devm_add_action(dev, gud_free_buffers_and_mutex, gdrm);
 	if (ret)
 		return ret;
 
-- 
2.23.0

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