[PATCH] x86: on x86_64, correct reading of PC RTC when update in progress in time_64.c

["David P. Reed" <dpreed@reed.com>]

Correct potentially unstable PC RTC time register reading in time_64.c

Stop the use of an incorrect technique for reading the standard PC RTC
timer, which is documented to "disconnect" time registers from the bus
while updates are in progress.  The use of UIP flag while interrupts
are disabled to protect a 244 microsecond window is one of the
Motorola spec sheet's documented ways to read the RTC time registers
reliably.

The patch updates the misleading comments and also minimizes the amount of
time that the kernel disables interrupts during the reading.

Signed-off-by: David P. Reed <dpreed@reed.com>
---
Index: linux-2.6/arch/x86/kernel/time_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/time_64.c
+++ linux-2.6/arch/x86/kernel/time_64.c
@@ -160,22 +160,30 @@ unsigned long read_persistent_clock(void
 	unsigned long flags;
 	unsigned century = 0;

-	spin_lock_irqsave(&rtc_lock, flags);
+ retry:	spin_lock_irqsave(&rtc_lock, flags);
+	/* if UIP is clear, then we have >= 244 microseconds before RTC
+	 * registers will be updated.  Spec sheet says that this is the
+	 * reliable way to read RTC - registers invalid (off bus) during update
+	 */
+	if ((CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)) {
+	  spin_unlock_irqrestore(&rtc_lock, flags);
+	  cpu_relax();
+	  goto retry;
+	}

-	do {
-		sec = CMOS_READ(RTC_SECONDS);
-		min = CMOS_READ(RTC_MINUTES);
-		hour = CMOS_READ(RTC_HOURS);
-		day = CMOS_READ(RTC_DAY_OF_MONTH);
-		mon = CMOS_READ(RTC_MONTH);
-		year = CMOS_READ(RTC_YEAR);
+	/* now read all RTC registers while stable with interrupts disabled */
+
+	sec = CMOS_READ(RTC_SECONDS);
+	min = CMOS_READ(RTC_MINUTES);
+	hour = CMOS_READ(RTC_HOURS);
+	day = CMOS_READ(RTC_DAY_OF_MONTH);
+	mon = CMOS_READ(RTC_MONTH);
+	year = CMOS_READ(RTC_YEAR);
 #ifdef CONFIG_ACPI
-		if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
-					acpi_gbl_FADT.century)
-			century = CMOS_READ(acpi_gbl_FADT.century);
+	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
+				acpi_gbl_FADT.century)
+		century = CMOS_READ(acpi_gbl_FADT.century);
 #endif
-	} while (sec != CMOS_READ(RTC_SECONDS));
-
 	spin_unlock_irqrestore(&rtc_lock, flags);

 	/*


-
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