diff options
| author | Lubomir Rintel <lkundrak@v3.sk> | 2009-03-10 12:55:54 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-03-16 17:32:17 -0700 |
| commit | ca912f23933fd14fcab90465af245597dbee9272 (patch) | |
| tree | a5f12610c67e27df660236619d7aac6395be18d1 | |
| parent | 060ed9967c5edc627f7884a4976ecb54fd3ac034 (diff) | |
intel-agp: fix a panic with 1M of shared memory, no GTT entries
commit 9c1e8a4ebcc04226cb6f3a1bf1d72f4cafd6b089 upstream.
When GTT size is equal to amount of video memory, the amount of GTT
entries is computed lower than zero, which is invalid and leads to
off-by-one error in intel_i915_configure()
Originally posted here:
http://bugzilla.kernel.org/show_bug.cgi?id=12539
http://bugzilla.redhat.com/show_bug.cgi?id=445592
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Cc: Lubomir Rintel <lkundrak@v3.sk>
Cc: Dave Airlie <airlied@linux.ie>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/char/agp/intel-agp.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c index c7714185f83..4373adb2119 100644 --- a/drivers/char/agp/intel-agp.c +++ b/drivers/char/agp/intel-agp.c @@ -633,13 +633,15 @@ static void intel_i830_init_gtt_entries(void) break; } } - if (gtt_entries > 0) + if (gtt_entries > 0) { dev_info(&agp_bridge->dev->dev, "detected %dK %s memory\n", gtt_entries / KB(1), local ? "local" : "stolen"); - else + gtt_entries /= KB(4); + } else { dev_info(&agp_bridge->dev->dev, "no pre-allocated video memory detected\n"); - gtt_entries /= KB(4); + gtt_entries = 0; + } intel_private.gtt_entries = gtt_entries; } |