x86: HPET fix moronic 32/64bit thinko

commit f7676254f179eac6b5244a80195ec8ae0e9d4606 upstream

We use the HPET only in 32bit mode because:
1) some HPETs are 32bit only
2) on i386 there is no way to read/write the HPET atomic 64bit wide

The HPET code unification done by the "moron of the year" did
not take into account that unsigned long is different on 32 and
64 bit.

This thinko results in a possible endless loop in the clockevents
code, when the return comparison fails due to the 64bit/332bit
unawareness.

unsigned long cnt = (u32) hpet_read() + delta can wrap over 32bit.
but the final compare will fail and return -ETIME causing endless
loops.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 1cbbf7211164a22e1994cf3e233458899a9818b4..791c369dd81362d9a1d7d6ac532eca804748a59e 100644 (file)
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -282,15 +282,15 @@ static void hpet_legacy_set_mode(enum clock_event_mode mode,
 }
 
 static int hpet_legacy_next_event(unsigned long delta,
-                          struct clock_event_device *evt)
+                                 struct clock_event_device *evt)
 {
-       unsigned long cnt;
+       u32 cnt;
 
        cnt = hpet_readl(HPET_COUNTER);
-       cnt += delta;
+       cnt += (u32) delta;
        hpet_writel(cnt, HPET_T0_CMP);
 
-       return ((long)(hpet_readl(HPET_COUNTER) - cnt ) > 0) ? -ETIME : 0;
+       return (s32)((u32)hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0;
 }
 
 /*