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drm/radeon/kms: add bounds checking to avivo pll algo

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Prevent divider overflow.
Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=28932

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2011-02-14 11:43:10 -05:00 committed by Dave Airlie
parent bd91572e77
commit a4b40d5d97
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/radeon/radeon_display.c
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@ -793,6 +793,11 @@ 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,
@ -826,6 +831,11 @@ 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;
}