Merge tag 'drm-misc-next-fixes-2021-04-29' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

Two patches in drm-misc-next-fixes this week, one to fix the error
handling in TTM when a BO can't be swapped out and one to prevent a
wrong dereference in efifb.

Signed-off-by: Dave Airlie <[e-mail]>

From: Maxime Ripard <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/20210429090308.k3fuqvenf6vupfmg@gilmour

drivers/gpu/drm/ttm/ttm_device.c

···
 {
 	struct ttm_global *glob = &ttm_glob;
 	struct ttm_device *bdev;
-	int ret = -EBUSY;
+	int ret = 0;
 
 	mutex_lock(&ttm_global_mutex);
 	list_for_each_entry(bdev, &glob->device_list, device_list) {

drivers/gpu/drm/ttm/ttm_tt.c

···
 	       ttm_dma32_pages_limit) {
 
 		ret = ttm_global_swapout(ctx, GFP_KERNEL);
+		if (ret == 0)
+			break;
 		if (ret < 0)
 			goto error;
 	}

drivers/gpu/drm/vmwgfx/ttm_memory.c

···
 		spin_unlock(&glob->lock);
 		ret = ttm_global_swapout(ctx, GFP_KERNEL);
 		spin_lock(&glob->lock);
-		if (unlikely(ret < 0))
+		if (unlikely(ret <= 0))
 			break;
 	}
 

drivers/video/fbdev/efifb.c

···
 		goto err_fb_dealoc;
 	}
 	fb_info(info, "%s frame buffer device\n", info->fix.id);
-	pm_runtime_get_sync(&efifb_pci_dev->dev);
+	if (efifb_pci_dev)
+		pm_runtime_get_sync(&efifb_pci_dev->dev);
 	return 0;
 
 err_fb_dealoc:
···
 	unregister_framebuffer(info);
 	sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
 	framebuffer_release(info);
-	pm_runtime_put(&efifb_pci_dev->dev);
+	if (efifb_pci_dev)
+		pm_runtime_put(&efifb_pci_dev->dev);
 
 	return 0;
 }