From: Roel Kluin <roel.kluin@gmail.com>
To: adaplas@gmail.com
Cc: linux-fbdev-devel@lists.sourceforge.net
Subject: [PATCH] fbdev: asiliantfb: unsigned subtraction not less than 0
Date: Sun, 18 Jan 2009 23:17:38 +0100 [thread overview]
Message-ID: <4973AA82.2070205@gmail.com> (raw)
An unsigned subtraction does not become less than 0
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
diff --git a/drivers/video/asiliantfb.c b/drivers/video/asiliantfb.c
index 1fd22f4..de6c408 100644
--- a/drivers/video/asiliantfb.c
+++ b/drivers/video/asiliantfb.c
@@ -140,7 +140,7 @@ static void asiliant_calc_dclk2(u32 *ppixclock, u8 *dclk2_m, u8 *dclk2_n, u8 *dc
/* 3 <= m <= 257 */
if (m >= 3 && m <= 257) {
- unsigned new_error = ((Ftarget * n) - (Fref * m)) >= 0 ?
+ unsigned new_error = Ftarget * n >= Fref * m ?
((Ftarget * n) - (Fref * m)) : ((Fref * m) - (Ftarget * n));
if (new_error < best_error) {
best_n = n;
@@ -152,7 +152,7 @@ static void asiliant_calc_dclk2(u32 *ppixclock, u8 *dclk2_m, u8 *dclk2_n, u8 *dc
else if (m <= 1028) {
/* remember there are still only 8-bits of precision in m, so
* avoid over-optimistic error calculations */
- unsigned new_error = ((Ftarget * n) - (Fref * (m & ~3))) >= 0 ?
+ unsigned new_error = Ftarget * n >= Fref * (m & ~3) ?
((Ftarget * n) - (Fref * (m & ~3))) : ((Fref * (m & ~3)) - (Ftarget * n));
if (new_error < best_error) {
best_n = n;
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reply other threads:[~2009-01-18 22:39 UTC|newest]
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