[CI] drm: Ensure ioctls are drained before device unplug

["Thomas Hellström" <thomas.hellstrom@linux.intel.com>]

There is a check that blocks ioctls after device unplug,
but we have no check that running ioctls have actually
completed at unplug time. (And for some IOCTLs like
fence waits, that actually makes sense).
However, implement ioctl draining to have CI check for
lockdep issues.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/drm_ioctl.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index ff193155129e..c87a925f0fe4 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -789,19 +789,22 @@ long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata,
 {
 	struct drm_file *file_priv = file->private_data;
 	struct drm_device *dev = file_priv->minor->dev;
-	int ret;
+	int ret, idx;
 
 	/* Update drm_file owner if fd was passed along. */
 	drm_file_update_pid(file_priv);
 
-	if (drm_dev_is_unplugged(dev))
+	if (!drm_dev_enter(dev, &idx))
 		return -ENODEV;
 
 	ret = drm_ioctl_permit(flags, file_priv);
 	if (unlikely(ret))
-		return ret;
+		goto out;
 
-	return func(dev, kdata, file_priv);
+	ret = func(dev, kdata, file_priv);
+ out:
+	drm_dev_exit(idx);
+	return ret;
 }
 EXPORT_SYMBOL(drm_ioctl_kernel);
 
-- 
2.53.0