[ARM] 3616/1: fix timer handler wrap logic for a number of platforms

Patch from Lennert Buytenhek

A couple of platforms aren't using the right comparison type in their
timer interrupt handlers (as we're comparing two wrapping timestamps,
we need a bmi/bpl-type comparison, not an unsigned comparison) -- this
patch fixes them up.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

5 files changed, 9 insertions, 6 deletions

diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index dcd417625389..d0eb364fc014 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -103,7 +103,8 @@ static int ep93xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
         write_seqlock(&xtime_lock);
 
         __raw_writel(1, EP93XX_TIMER1_CLEAR);
-        while (__raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time
+        while ((signed long)
+                (__raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time)
                                                 >= TIMER4_TICKS_PER_JIFFY) {
                 last_jiffy_time += TIMER4_TICKS_PER_JIFFY;
                 timer_tick(regs);
diff --git a/arch/arm/mach-ixp2000/core.c b/arch/arm/mach-ixp2000/core.c
index 6e8d504aca55..186f632035b8 100644
--- a/arch/arm/mach-ixp2000/core.c
+++ b/arch/arm/mach-ixp2000/core.c
@@ -211,7 +211,8 @@ static int ixp2000_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
         /* clear timer 1 */
         ixp2000_reg_wrb(IXP2000_T1_CLR, 1);
 
-        while ((next_jiffy_time - *missing_jiffy_timer_csr) > ticks_per_jiffy) {
+        while ((signed long)(next_jiffy_time - *missing_jiffy_timer_csr)
+                                                        >= ticks_per_jiffy) {
                 timer_tick(regs);
                 next_jiffy_time -= ticks_per_jiffy;
         }
diff --git a/arch/arm/mach-ixp23xx/core.c b/arch/arm/mach-ixp23xx/core.c
index affd1d5d7440..e2aad734080e 100644
--- a/arch/arm/mach-ixp23xx/core.c
+++ b/arch/arm/mach-ixp23xx/core.c
@@ -334,7 +334,7 @@ void __init ixp23xx_init_irq(void)
 /*************************************************************************
  * Timer-tick functions for IXP23xx
  *************************************************************************/
-#define CLOCK_TICKS_PER_USEC    CLOCK_TICK_RATE / (USEC_PER_SEC)
+#define CLOCK_TICKS_PER_USEC    (CLOCK_TICK_RATE / USEC_PER_SEC)
 
 static unsigned long next_jiffy_time;
 
@@ -353,7 +353,7 @@ ixp23xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 {
         /* Clear Pending Interrupt by writing '1' to it */
         *IXP23XX_TIMER_STATUS = IXP23XX_TIMER1_INT_PEND;
-        while ((*IXP23XX_TIMER_CONT - next_jiffy_time) > LATCH) {
+        while ((signed long)(*IXP23XX_TIMER_CONT - next_jiffy_time) >= LATCH) {
                 timer_tick(regs);
                 next_jiffy_time += LATCH;
         }
diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index 00b761ff0f9c..bf25a76e9bdf 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -276,7 +276,7 @@ static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id, struct pt_regs
         /*
          * Catch up with the real idea of time
          */
-        while ((*IXP4XX_OSTS - last_jiffy_time) > LATCH) {
+        while ((signed long)(*IXP4XX_OSTS - last_jiffy_time) >= LATCH) {
                 timer_tick(regs);
                 last_jiffy_time += LATCH;
         }
diff --git a/arch/arm/plat-omap/timer32k.c b/arch/arm/plat-omap/timer32k.c
index b2a943bf11ef..3461a6c9665c 100644
--- a/arch/arm/plat-omap/timer32k.c
+++ b/arch/arm/plat-omap/timer32k.c
@@ -210,7 +210,8 @@ static irqreturn_t omap_32k_timer_interrupt(int irq, void *dev_id,
 
         now = omap_32k_sync_timer_read();
 
-        while (now - omap_32k_last_tick >= OMAP_32K_TICKS_PER_HZ) {
+        while ((signed long)(now - omap_32k_last_tick)
+                                                >= OMAP_32K_TICKS_PER_HZ) {
                 omap_32k_last_tick += OMAP_32K_TICKS_PER_HZ;
                 timer_tick(regs);
         }