drm/i915: In the debugfs interface, unmap our address instead of the page's.

Fixes a BUG_ON in kmap_atomic for the following atomic mapping with
USER0 type.

Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 18476bf..463e8d0 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -272,7 +272,7 @@ static void i915_dump_pages(struct seq_file *m, struct page **pages, int page_co
                mem = kmap_atomic(pages[page], KM_USER0);
                for (i = 0; i < PAGE_SIZE; i += 4)
                        seq_printf(m, "%08x :  %08x\n", i, mem[i / 4]);
-               kunmap_atomic(pages[page], KM_USER0);
+               kunmap_atomic(mem, KM_USER0);
        }
 }