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| author | Andrew Victor <andrew@sanpeople.com> | 2006-03-22 20:14:13 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-03-22 20:14:13 +0000 |
| commit | 39806805de0314d5847bfd6d046ad7d4407ccd46 (patch) | |
| tree | 6a05969531953e3831650cde71a9143571472456 /arch | |
| parent | 112d02e8d556ea0512afcfc3b0110c87ec9eb5f9 (diff) | |
| download | linux-3.10-39806805de0314d5847bfd6d046ad7d4407ccd46.tar.gz linux-3.10-39806805de0314d5847bfd6d046ad7d4407ccd46.tar.bz2 linux-3.10-39806805de0314d5847bfd6d046ad7d4407ccd46.zip | |
[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')
| -rw-r--r-- | arch/arm/mach-at91rm9200/time.c | 4 |
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); |