From: Michel Thierry <michel.thierry@intel.com>
Date: Thu, 25 Jun 2015 11:59:38 +0000 (+0100)
Subject: drm/i915/ppgtt: Break loop in gen8_ppgtt_clear_range failure path
X-Git-Tag: v4.2-rc1~33^2~3
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=00245266b4be4fbe989ee073663f56716da6c1f3;p=karo-tx-linux.git

drm/i915/ppgtt: Break loop in gen8_ppgtt_clear_range failure path

If for some reason [1], the page directory/table does not exist, clear_range
would end up in an infinite while loop.

Introduced by commit 06fda602dbca ("drm/i915: Create page table allocators").

[1] This is already being addressed in one of Mika's patches:
http://mid.gmane.org/1432314314-23530-17-git-send-email-mika.kuoppala@intel.com

Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: stable@vger.kernel.org
Reported-by: John Harrison <john.c.harrison@intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 619dad1b2386..9daa2883ac18 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -516,17 +516,17 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
 		struct page *page_table;
 
 		if (WARN_ON(!ppgtt->pdp.page_directory[pdpe]))
-			continue;
+			break;
 
 		pd = ppgtt->pdp.page_directory[pdpe];
 
 		if (WARN_ON(!pd->page_table[pde]))
-			continue;
+			break;
 
 		pt = pd->page_table[pde];
 
 		if (WARN_ON(!pt->page))
-			continue;
+			break;
 
 		page_table = pt->page;