diff options
author | Mike Frysinger <vapier@gentoo.org> | 2011-04-04 15:26:11 (GMT) |
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committer | Mike Frysinger <vapier@gentoo.org> | 2011-04-13 23:34:05 (GMT) |
commit | 0bf02ce605b8780223b10739ab7c533de9eb10cc (patch) | |
tree | 2a7c66fa16817062979648dd434f9067f279c5a2 /arch | |
parent | ce24ee468aabb7c499b910aa3c4ab3cb338326ed (diff) | |
download | linux-0bf02ce605b8780223b10739ab7c533de9eb10cc.tar.xz |
Blackfin: time-ts: ack gptimer sooner to avoid missing short ints
If the period of a gptimer is fairly low, we might miss an interrupt
by acking it too late (we end up acking the new int as well).
Reported-by: Isabelle Leonardi <i.leonardi@detracom.fr>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/blackfin/kernel/time-ts.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/blackfin/kernel/time-ts.c b/arch/blackfin/kernel/time-ts.c index 8c9a43d..cdb4beb 100644 --- a/arch/blackfin/kernel/time-ts.c +++ b/arch/blackfin/kernel/time-ts.c @@ -206,8 +206,14 @@ irqreturn_t bfin_gptmr0_interrupt(int irq, void *dev_id) { struct clock_event_device *evt = dev_id; smp_mb(); - evt->event_handler(evt); + /* + * We want to ACK before we handle so that we can handle smaller timer + * intervals. This way if the timer expires again while we're handling + * things, we're more likely to see that 2nd int rather than swallowing + * it by ACKing the int at the end of this handler. + */ bfin_gptmr0_ack(); + evt->event_handler(evt); return IRQ_HANDLED; } |