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authorAndrew Victor <andrew@sanpeople.com>2006-03-22 20:14:13 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-03-22 20:14:13 +0000
commit39806805de0314d5847bfd6d046ad7d4407ccd46 (patch)
tree6a05969531953e3831650cde71a9143571472456 /arch/arm
parent112d02e8d556ea0512afcfc3b0110c87ec9eb5f9 (diff)
[ARM] 3384/1: AT91RM9200: Timer
Patch from Andrew Victor If the timer interrupt is ever significantly delayed (or after the system was suspended), the system could spin incrementing the time for too long. The fix is to replace the "do {} while" with a "while {}". Orignal patch by Savin Zlobec and Peter Menzebach. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-at91rm9200/time.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/mach-at91rm9200/time.c b/arch/arm/mach-at91rm9200/time.c
index 1b6dd2deeb2..7ffcf443b99 100644
--- a/arch/arm/mach-at91rm9200/time.c
+++ b/arch/arm/mach-at91rm9200/time.c
@@ -71,11 +71,11 @@ static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id, struct pt_r
if (at91_sys_read(AT91_ST_SR) & AT91_ST_PITS) { /* This is a shared interrupt */
write_seqlock(&xtime_lock);
- do {
+ while (((read_CRTR() - at91_sys_read(AT91_ST_RTAR)) & AT91_ST_ALMV) >= LATCH) {
timer_tick(regs);
rtar = (at91_sys_read(AT91_ST_RTAR) + LATCH) & AT91_ST_ALMV;
at91_sys_write(AT91_ST_RTAR, rtar);
- } while (((read_CRTR() - at91_sys_read(AT91_ST_RTAR)) & AT91_ST_ALMV) >= LATCH);
+ }
write_sequnlock(&xtime_lock);