drm: As a workaround don't tear down sg with a modesetting driver.

- This allows me to maintain a useful prototype driver.

1 files changed, 4 insertions, 1 deletions

diff --git a/linux-core/drm_drv.c b/linux-core/drm_drv.c
index deb8eb9c..4e7c531a 100644
--- a/linux-core/drm_drv.c
+++ b/linux-core/drm_drv.c
@@ -242,7 +242,10 @@ int drm_lastclose(struct drm_device * dev)
 		dev->agp->acquired = 0;
 		dev->agp->enabled = 0;
 	}
-	if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
+
+	/* You're supposed to have a real memory manager for modesetting, but this'll suffice as a temporary workaround. */
+	/* This assumes sgdma is inited at load time. */
+	if (drm_core_check_feature(dev, DRIVER_SG) && !drm_core_check_feature(dev, DRIVER_MODESET) && dev->sg) {
 		drm_sg_cleanup(dev->sg);
 		dev->sg = NULL;
 	}