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authorLubomir Rintel <lkundrak@v3.sk>2009-03-10 12:55:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-03-10 15:55:11 -0700
commit9c1e8a4ebcc04226cb6f3a1bf1d72f4cafd6b089 (patch)
tree30a76767516304283f29d1997cd6a285e39d160a /drivers/char/agp
parent229cc58ba2b5a83b0b55764c6cb98695c106238a (diff)
intel-agp: fix a panic with 1M of shared memory, no GTT entries
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> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/agp')
-rw-r--r--drivers/char/agp/intel-agp.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index c7714185f831..4373adb2119a 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;
}