linux-kernel - Re: [2.6.33-rc6-git regression] idr fix breaks Xorg

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Message-ID: <4B6A3AED.1000102@kernel.org>
Date:	Thu, 04 Feb 2010 12:11:41 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Andy Isaacson <adi@...apodia.org>
CC:	linux-kernel@...r.kernel.org, dri-devel@...ts.sourceforge.net
Subject: Re: [2.6.33-rc6-git regression] idr fix breaks Xorg

On 02/04/2010 10:28 AM, Andy Isaacson wrote:
> On my Dell Latitude e4300 commit 859ddf0974 ("idr: fix a critical
> misallocation bug") causes Xorg to segfault with the following
> backtrace:

Does the following patch make any difference?

diff --git a/lib/idr.c b/lib/idr.c
index ba7d37c..a96c604 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -140,7 +140,8 @@ static int sub_alloc(struct idr *idp, int *starting_id, struct idr_layer **pa)
 	id = *starting_id;
  restart:
 	p = idp->top;
-	l = p->layer;
+	l = idp->layers;
+	pa[l--] = NULL;
 	while (1) {
 		/*
 		 * We run around this while until we reach the leaf node...


-- 
tejun
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