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| author | Ralf Baechle <ralf@linux-mips.org> | 2006-03-14 23:46:58 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2006-03-18 16:59:29 +0000 |
| commit | d6bd0e6b32ea72be91e5789b1e838c244f8a05d9 (patch) | |
| tree | 2eb5551533165cb7772ffdef3d8cbdbac1050cb6 /arch/mips/kernel/time.c | |
| parent | 966f4406d903a4214fdc74bec54710c6232a95b8 (diff) | |
| download | linux-d6bd0e6b32ea72be91e5789b1e838c244f8a05d9.tar.gz linux-d6bd0e6b32ea72be91e5789b1e838c244f8a05d9.tar.bz2 linux-d6bd0e6b32ea72be91e5789b1e838c244f8a05d9.zip | |
[MIPS] Protect more of timer_interrupt() by xtime_lock.
From Dave Johnson <djohnson+linuxmips@sw.starentnetworks.com>:
* do_timer() expects the arch-specific handler to take the lock as it
modifies jiffies[_64] and xtime.
* writing timerhi/lo in timer_interrupt() will mess up
fixed_rate_gettimeoffset() which reads timerhi/lo.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/time.c')
| -rw-r--r-- | arch/mips/kernel/time.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c index 42c94c771afb..51273b7297a7 100644 --- a/arch/mips/kernel/time.c +++ b/arch/mips/kernel/time.c @@ -424,6 +424,8 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) unsigned long j; unsigned int count; + write_seqlock(&xtime_lock); + count = mips_hpt_read(); mips_timer_ack(); @@ -441,7 +443,6 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) * CMOS clock accordingly every ~11 minutes. rtc_set_time() has to be * called as close as possible to 500 ms before the new second starts. */ - write_seqlock(&xtime_lock); if (ntp_synced() && xtime.tv_sec > last_rtc_update + 660 && (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && @@ -453,7 +454,6 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) last_rtc_update = xtime.tv_sec - 600; } } - write_sequnlock(&xtime_lock); /* * If jiffies has overflown in this timer_interrupt, we must @@ -496,6 +496,8 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) } } + write_sequnlock(&xtime_lock); + /* * In UP mode, we call local_timer_interrupt() to do profiling * and process accouting. |