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| 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/mac | |
| parent | 9e98c678c2d6ae3a17cb2de55d17f69dddaa231b (diff) | |
| download | lwn-1efdd4bd254311498123a15fa0acd565f454da97.tar.gz lwn-1efdd4bd254311498123a15fa0acd565f454da97.zip | |
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/mac')
| -rw-r--r-- | arch/m68k/mac/via.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/m68k/mac/via.c b/arch/m68k/mac/via.c index 0b0289459173..5c3d650d6a6f 100644 --- a/arch/m68k/mac/via.c +++ b/arch/m68k/mac/via.c @@ -440,6 +440,8 @@ void via_nubus_irq_shutdown(int irq) * via6522.c :-), disable/pending masks added. */ +#define VIA_TIMER_1_INT BIT(6) + void via1_irq(struct irq_desc *desc) { int irq_num; @@ -449,6 +451,21 @@ void via1_irq(struct irq_desc *desc) if (!events) return; + irq_num = IRQ_MAC_TIMER_1; + irq_bit = VIA_TIMER_1_INT; + if (events & irq_bit) { + unsigned long flags; + + local_irq_save(flags); + via1[vIFR] = irq_bit; + generic_handle_irq(irq_num); + local_irq_restore(flags); + + events &= ~irq_bit; + if (!events) + return; + } + irq_num = VIA1_SOURCE_BASE; irq_bit = 1; do { |