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i915/gtt: fix ordering causing DMAR errors on object teardown.

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Previous to the last GTT rework we always rewrote the GTT then unmapped the
object, somehow this got reversed in the rework in 2.6.37-rc5 timeframe.

This fix needs to go to stable in an alternate form since the code changed.

This fixes DMAR reports on my Ironlake HP2540p.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2011-01-12 11:39:48 +10:00
parent a46f3108b1
commit d15eda5c6e
1 changed files with 2 additions and 2 deletions
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4
drivers/char/agp/intel-gtt.c
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@ -1000,14 +1000,14 @@ static int intel_fake_agp_remove_entries(struct agp_memory *mem,
if (mem->page_count == 0)
return 0;
intel_gtt_clear_range(pg_start, mem->page_count);
if (intel_private.base.needs_dmar) {
intel_gtt_unmap_memory(mem->sg_list, mem->num_sg);
mem->sg_list = NULL;
mem->num_sg = 0;
}
intel_gtt_clear_range(pg_start, mem->page_count);
return 0;
}