diff options
| author | Finn Thain <fthain@telegraphics.com.au> | 2018-12-01 11:53:10 +1100 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2019-03-25 10:22:24 +0100 |
| commit | 1efdd4bd254311498123a15fa0acd565f454da97 (patch) | |
| tree | 6eed2d1e020561326c3754973e588c947673a5b0 /arch/m68k/mvme147 | |
| parent | 9e98c678c2d6ae3a17cb2de55d17f69dddaa231b (diff) | |
m68k: Call timer_interrupt() with interrupts disabled
Some platforms execute their timer handler with the interrupt priority
level set below 6. That means the handler could be interrupted by another
driver and this could lead to re-entry of the timer core.
Avoid this by use of local_irq_save/restore for timer interrupt dispatch.
This provides mutual exclusion around the timer interrupt flag access
which is needed later in this series for the clocksource conversion.
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/alpine.DEB.2.21.1811131407120.2697@nanos.tec.linutronix.de
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/mvme147')
| -rw-r--r-- | arch/m68k/mvme147/config.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/arch/m68k/mvme147/config.c b/arch/m68k/mvme147/config.c index adea549d240e..93c68d2b8e0e 100644 --- a/arch/m68k/mvme147/config.c +++ b/arch/m68k/mvme147/config.c @@ -45,11 +45,6 @@ extern void mvme147_reset (void); static int bcd2int (unsigned char b); -/* Save tick handler routine pointer, will point to xtime_update() in - * kernel/time/timekeeping.c, called via mvme147_process_int() */ - -irq_handler_t tick_handler; - int __init mvme147_parse_bootinfo(const struct bi_record *bi) { @@ -104,16 +99,23 @@ void __init config_mvme147(void) static irqreturn_t mvme147_timer_int (int irq, void *dev_id) { + irq_handler_t timer_routine = dev_id; + unsigned long flags; + + local_irq_save(flags); m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1; - return tick_handler(irq, dev_id); + timer_routine(0, NULL); + local_irq_restore(flags); + + return IRQ_HANDLED; } void mvme147_sched_init (irq_handler_t timer_routine) { - tick_handler = timer_routine; - if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1", NULL)) + if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1", + timer_routine)) pr_err("Couldn't register timer interrupt\n"); /* Init the clock with a value */ |