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

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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>
This commit is contained in:
Michel Thierry 2015-06-25 12:59:38 +01:00 committed by Jani Nikula
parent ac88cd7384
commit 00245266b4
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/i915/i915_gem_gtt.c
View File

@ -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;