1 files changed, 37 insertions, 23 deletions

diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index 5ca1d80de182..c20171078d1d 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c
@@ -21,6 +21,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/pci.h>
+#include <linux/delay.h>
 #include <asm/io.h>
 
 /*
@@ -151,13 +152,13 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_LE,
  */
 static int verify_pmtmr_rate(void)
 {
-	u32 value1, value2;
+	cycle_t value1, value2;
 	unsigned long count, delta;
 
 	mach_prepare_counter();
-	value1 = read_pmtmr();
+	value1 = clocksource_acpi_pm.read();
 	mach_countup(&count);
-	value2 = read_pmtmr();
+	value2 = clocksource_acpi_pm.read();
 	delta = (value2 - value1) & ACPI_PM_MASK;
 
 	/* Check that the PMTMR delta is within 5% of what we expect */
@@ -175,10 +176,15 @@ static int verify_pmtmr_rate(void)
 #define verify_pmtmr_rate() (0)
 #endif
 
+/* Number of monotonicity checks to perform during initialization */
+#define ACPI_PM_MONOTONICITY_CHECKS 10
+/* Number of reads we try to get two different values */
+#define ACPI_PM_READ_CHECKS 10000
+
 static int __init init_acpi_pm_clocksource(void)
 {
-	u32 value1, value2;
-	unsigned int i;
+	cycle_t value1, value2;
+	unsigned int i, j = 0;
 
 	if (!pmtmr_ioport)
 		return -ENODEV;
@@ -187,24 +193,29 @@ static int __init init_acpi_pm_clocksource(void)
 						clocksource_acpi_pm.shift);
 
 	/* "verify" this timing source: */
-	value1 = read_pmtmr();
-	for (i = 0; i < 10000; i++) {
-		value2 = read_pmtmr();
-		if (value2 == value1)
-			continue;
-		if (value2 > value1)
-			goto pm_good;
-		if ((value2 < value1) && ((value2) < 0xFFF))
-			goto pm_good;
-		printk(KERN_INFO "PM-Timer had inconsistent results:"
-			" 0x%#x, 0x%#x - aborting.\n", value1, value2);
-		return -EINVAL;
+	for (j = 0; j < ACPI_PM_MONOTONICITY_CHECKS; j++) {
+		udelay(100 * j);
+		value1 = clocksource_acpi_pm.read();
+		for (i = 0; i < ACPI_PM_READ_CHECKS; i++) {
+			value2 = clocksource_acpi_pm.read();
+			if (value2 == value1)
+				continue;
+			if (value2 > value1)
+				break;
+			if ((value2 < value1) && ((value2) < 0xFFF))
+				break;
+			printk(KERN_INFO "PM-Timer had inconsistent results:"
+			       " 0x%#llx, 0x%#llx - aborting.\n",
+			       value1, value2);
+			return -EINVAL;
+		}
+		if (i == ACPI_PM_READ_CHECKS) {
+			printk(KERN_INFO "PM-Timer failed consistency check "
+			       " (0x%#llx) - aborting.\n", value1);
+			return -ENODEV;
+		}
 	}
-	printk(KERN_INFO "PM-Timer had no reasonable result:"
-			" 0x%#x - aborting.\n", value1);
-	return -ENODEV;
 
-pm_good:
 	if (verify_pmtmr_rate() != 0)
 		return -ENODEV;
 
@@ -226,9 +237,12 @@ static int __init parse_pmtmr(char *arg)
 
 	if (strict_strtoul(arg, 16, &base))
 		return -EINVAL;
-
+#ifdef CONFIG_X86_64
+	if (base > UINT_MAX)
+		return -ERANGE;
+#endif
 	printk(KERN_INFO "PMTMR IOPort override: 0x%04x -> 0x%04lx\n",
-	       (unsigned int)pmtmr_ioport, base);
+	       pmtmr_ioport, base);
 	pmtmr_ioport = base;
 
 	return 1;