m68k: cnt reaches -1, not 0

With the postfix decrement cnt reaches -1 rather than 0.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

diff --git a/arch/m68k/amiga/config.c b/arch/m68k/amiga/config.c
index 6e562751ad51b5653181165d8b4ffc54f6cb1b8b..6c74751c7b821bbc5eedfeeba20a2bc9673149bb 100644 (file)
--- a/arch/m68k/amiga/config.c
+++ b/arch/m68k/amiga/config.c
@@ -574,10 +574,11 @@ static int a2000_hwclk(int op, struct rtc_time *t)
 
        tod_2000.cntrl1 = TOD2000_CNTRL1_HOLD;
 
-       while ((tod_2000.cntrl1 & TOD2000_CNTRL1_BUSY) && cnt--) {
+       while ((tod_2000.cntrl1 & TOD2000_CNTRL1_BUSY) && cnt) {
                tod_2000.cntrl1 &= ~TOD2000_CNTRL1_HOLD;
                udelay(70);
                tod_2000.cntrl1 |= TOD2000_CNTRL1_HOLD;
+               --cnt;
        }
 
        if (!cnt)
@@ -649,10 +650,11 @@ static int amiga_set_clock_mmss(unsigned long nowtime)
 
                tod_2000.cntrl1 |= TOD2000_CNTRL1_HOLD;
 
-               while ((tod_2000.cntrl1 & TOD2000_CNTRL1_BUSY) && cnt--) {
+               while ((tod_2000.cntrl1 & TOD2000_CNTRL1_BUSY) && cnt) {
                        tod_2000.cntrl1 &= ~TOD2000_CNTRL1_HOLD;
                        udelay(70);
                        tod_2000.cntrl1 |= TOD2000_CNTRL1_HOLD;
+                       --cnt;
                }
 
                if (!cnt)