x86: HPET fix moronic 32/64bit thinko

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>

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 2256315416d81e62520a22410ed6596f487996de..801497a16e0e487e565b29b2c88e3e55bfe6c086 100644 (file)
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -270,15 +270,15 @@ 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;
 }
 
 /*