linux-kernel - Re: [PATCH] intel-agp.c: Fix crash when accessing nonexistent GTT entries in i915

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Date:	Wed, 24 Mar 2010 11:14:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:	Christian Kujau <lists@...dbynature.de>,
	Zhenyu Wang <zhenyuw@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>, David.Woodhouse@...el.com,
	dwmw2@...radead.org, eric@...olt.net, ben@...adent.org.uk,
	gregkh@...e.de
Subject: Re: [PATCH] intel-agp.c: Fix crash when accessing nonexistent GTT 
 entries in i915

On Tue, 23 Mar 2010 12:40:05 +0100
Miguel Ojeda <miguel.ojeda.sandonis@...il.com> wrote:

> On Tue, Mar 23, 2010 at 5:14 AM, Christian Kujau <lists@...dbynature.de> wrote:
> > On Mon, 22 Mar 2010 at 20:57, Andrew Morton wrote:
> >> On Sun, 21 Mar 2010 16:30:20 +0100 Miguel Ojeda <miguel.ojeda.sandonis@...il.com> wrote:
> >> > I bisected in order to find the commit 5877960869333e42ebeb733e8d9d5630ff96d350.
> >
> > I believe this[0] is fc61901373987ad61851ed001fe971f3ee8d96a3 upstream:
> 
> Indeed. Also in
> 
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.32.y.git;a=commit;h=fc61901373987ad61851ed001fe971f3ee8d96a3

Does reverting that patch from the current code fix the crash?

--- a/drivers/char/agp/intel-agp.c~revert-1
+++ a/drivers/char/agp/intel-agp.c
@@ -207,7 +207,6 @@ static struct _intel_private {
 	 * popup and for the GTT.
 	 */
 	int gtt_entries;			/* i830+ */
-	int gtt_total_size;
 	union {
 		void __iomem *i9xx_flush_page;
 		void *i8xx_flush_page;
@@ -1239,7 +1238,7 @@ static int intel_i915_configure(void)
 	readl(intel_private.registers+I810_PGETBL_CTL);	/* PCI Posting. */
 
 	if (agp_bridge->driver->needs_scratch_page) {
-		for (i = intel_private.gtt_entries; i < intel_private.gtt_total_size; i++) {
+		for (i = intel_private.gtt_entries; i < current_size->num_entries; i++) {
 			writel(agp_bridge->scratch_page, intel_private.gtt+i);
 		}
 		readl(intel_private.gtt+i-1);	/* PCI Posting. */
@@ -1394,8 +1393,6 @@ static int intel_i915_create_gatt_table(
 	if (!intel_private.gtt)
 		return -ENOMEM;
 
-	intel_private.gtt_total_size = gtt_map_size / 4;
-
 	temp &= 0xfff80000;
 
 	intel_private.registers = ioremap(temp, 128 * 4096);
@@ -1485,8 +1482,6 @@ static int intel_i965_create_gatt_table(
 	if (!intel_private.gtt)
 		return -ENOMEM;
 
-	intel_private.gtt_total_size = gtt_size / 4;
-
 	intel_private.registers = ioremap(temp, 128 * 4096);
 	if (!intel_private.registers) {
 		iounmap(intel_private.gtt);
_

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