From: Marcin Slusarz <marcin.slusarz@gmail.com>
Date: Mon, 22 Aug 2011 21:17:57 +0000 (+0000)
Subject: drm/ttm: fix ttm_bo_add_ttm(user) failure path
X-Git-Tag: v3.0.4~7
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0cfbab6a0b26aaf895d36ecd6fd2a1c5bde83841;p=karo-tx-linux.git

drm/ttm: fix ttm_bo_add_ttm(user) failure path

commit 7c4c3960dff109bc5db4c35da481c212dadb5eb5 upstream.

ttm_tt_destroy kfrees passed object, so we need to nullify
a reference to it.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 2e618b5ac465..b7f0726645ad 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -353,8 +353,10 @@ static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 
 		ret = ttm_tt_set_user(bo->ttm, current,
 				      bo->buffer_start, bo->num_pages);
-		if (unlikely(ret != 0))
+		if (unlikely(ret != 0)) {
 			ttm_tt_destroy(bo->ttm);
+			bo->ttm = NULL;
+		}
 		break;
 	default:
 		printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");