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iio: hrtimer-trigger: Mark hrtimer to expire in hard interrupt context 

[ Upstream commit 0178297c1e ]

On PREEMPT_RT enabled kernels unmarked hrtimers are moved into soft
interrupt expiry mode by default.

The IIO hrtimer-trigger needs to run in hard interrupt context since it
will end up calling generic_handle_irq() which has the requirement to run
in hard interrupt context.

Explicitly specify that the timer needs to run in hard interrupt context by
using the HRTIMER_MODE_REL_HARD flag.

Fixes: f5c2f0215e ("hrtimer: Move unmarked hrtimers to soft interrupt expiry on RT")
Reported-by: Christian Eggers <ceggers@arri.de>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20201117103751.16131-1-lars@metafoo.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Lars-Peter Clausen 2020-11-17 11:37:50 +01:00 committed by Greg Kroah-Hartman
parent d903b80e1a
commit da88903295
1 changed files with 2 additions and 2 deletions
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4
drivers/iio/trigger/iio-trig-hrtimer.c
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@ -102,7 +102,7 @@ static int iio_trig_hrtimer_set_state(struct iio_trigger *trig, bool state)
if (state)
hrtimer_start(&trig_info->timer, trig_info->period,
HRTIMER_MODE_REL);
HRTIMER_MODE_REL_HARD);
else
hrtimer_cancel(&trig_info->timer);
@ -132,7 +132,7 @@ static struct iio_sw_trigger *iio_trig_hrtimer_probe(const char *name)
trig_info->swt.trigger->ops = &iio_hrtimer_trigger_ops;
trig_info->swt.trigger->dev.groups = iio_hrtimer_attr_groups;
hrtimer_init(&trig_info->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer_init(&trig_info->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
trig_info->timer.function = iio_hrtimer_trig_handler;
trig_info->sampling_frequency = HRTIMER_DEFAULT_SAMPLING_FREQUENCY;