aty128fb: test below 0 on unsigned pll->post_divider

pll->post_divider is unsigned, so the test fails

Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/video/aty/aty128fb.c b/drivers/video/aty/aty128fb.c
index 07b6addbb3c1..243ea4ab20c8 100644
--- a/drivers/video/aty/aty128fb.c
+++ b/drivers/video/aty/aty128fb.c
@@ -1339,10 +1339,8 @@ static int aty128_var_to_pll(u32 period_in_ps, struct aty128_pll *pll,
         if (vclk * 12 < c.ppll_min)
                 vclk = c.ppll_min/12;
 
-        pll->post_divider = -1;
-
         /* now, find an acceptable divider */
-        for (i = 0; i < sizeof(post_dividers); i++) {
+        for (i = 0; i < ARRAY_SIZE(post_dividers); i++) {
                 output_freq = post_dividers[i] * vclk;
                 if (output_freq >= c.ppll_min && output_freq <= c.ppll_max) {
                         pll->post_divider = post_dividers[i];
@@ -1350,7 +1348,7 @@ static int aty128_var_to_pll(u32 period_in_ps, struct aty128_pll *pll,
                 }
         }
 
-        if (pll->post_divider < 0)
+        if (i == ARRAY_SIZE(post_dividers))
                 return -EINVAL;
 
         /* calculate feedback divider */