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drm/radeon/kms: add bounds checking to avivo pll algo
author
Alex Deucher
<alexdeucher@gmail.com>
Mon, 14 Feb 2011 16:43:10 +0000
(11:43 -0500)
committer
Greg Kroah-Hartman
<gregkh@suse.de>
Thu, 24 Feb 2011 22:54:24 +0000
(14:54 -0800)
commit
a4b40d5d97f5c9ad0b7f4bf2818291ca184bb433
upstream.
Prevent divider overflow.
Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=28932
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/gpu/drm/radeon/radeon_display.c
patch
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diff --git
a/drivers/gpu/drm/radeon/radeon_display.c
b/drivers/gpu/drm/radeon/radeon_display.c
index
a26a70d
..
c7d1fca
100644
(file)
--- a/
drivers/gpu/drm/radeon/radeon_display.c
+++ b/
drivers/gpu/drm/radeon/radeon_display.c
@@
-461,6
+461,11
@@
static void avivo_get_fb_div(struct radeon_pll *pll,
tmp *= target_clock;
*fb_div = tmp / pll->reference_freq;
*frac_fb_div = tmp % pll->reference_freq;
+
+ if (*fb_div > pll->max_feedback_div)
+ *fb_div = pll->max_feedback_div;
+ else if (*fb_div < pll->min_feedback_div)
+ *fb_div = pll->min_feedback_div;
}
static u32 avivo_get_post_div(struct radeon_pll *pll,
@@
-494,6
+499,11
@@
static u32 avivo_get_post_div(struct radeon_pll *pll,
post_div--;
}
+ if (post_div > pll->max_post_div)
+ post_div = pll->max_post_div;
+ else if (post_div < pll->min_post_div)
+ post_div = pll->min_post_div;
+
return post_div;
}