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authorAlex Deucher <alexdeucher@gmail.com>2011-02-14 11:43:10 -0500
committerDave Airlie <airlied@redhat.com>2011-02-15 09:18:50 +1000
commita4b40d5d97f5c9ad0b7f4bf2818291ca184bb433 (patch)
treed6286b29edab8ead8b42c9f53607e368ff57fe91 /drivers/gpu/drm/radeon/radeon_display.c
parentbd91572e77013aad242e2d2d565bd730c043f8b8 (diff)
drm/radeon/kms: add bounds checking to avivo pll algo
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>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_display.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_display.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 2eff98cfd72..0e657095de7 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -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;
}