From: Lars-Peter Clausen <lars@metafoo.de>
To: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Christian Eggers <ceggers@arri.de>,
linux-iio@vger.kernel.org, Lars-Peter Clausen <lars@metafoo.de>
Subject: [PATCH 1/2] iio: hrtimer-trigger: Mark hrtimer to expire in hard interrupt context
Date: Thu, 13 Aug 2020 09:53:57 +0200 [thread overview]
Message-ID: <20200813075358.13310-1-lars@metafoo.de> (raw)
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: f5c2f0215e36 ("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>
---
drivers/iio/trigger/iio-trig-hrtimer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/trigger/iio-trig-hrtimer.c b/drivers/iio/trigger/iio-trig-hrtimer.c
index f59bf8d58586..b11ca915fcb2 100644
--- a/drivers/iio/trigger/iio-trig-hrtimer.c
+++ b/drivers/iio/trigger/iio-trig-hrtimer.c
@@ -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;
--
2.20.1
next reply other threads:[~2020-08-13 7:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-13 7:53 Lars-Peter Clausen [this message]
2020-08-13 7:53 ` [PATCH 2/2] iio: sysfs-trigger: Mark irq_work to expire in hardirq context Lars-Peter Clausen
2020-08-13 9:11 ` [PATCH 1/2] iio: hrtimer-trigger: Mark hrtimer to expire in hard interrupt context Sebastian Andrzej Siewior
2020-08-13 9:46 ` Lars-Peter Clausen
2020-08-13 11:27 ` Sebastian Andrzej Siewior
2020-08-13 12:19 ` Thomas Gleixner
2020-08-13 14:55 ` Jonathan Cameron
2020-08-14 5:24 ` Lars-Peter Clausen
2020-08-14 10:30 ` Jonathan Cameron
2020-09-20 18:15 ` Jonathan Cameron
2020-09-21 7:17 ` Christian Eggers
2020-09-21 9:57 ` Jonathan Cameron
2020-09-21 12:27 ` Sebastian Andrzej Siewior
2020-09-21 13:32 ` Jonathan Cameron
2020-09-22 2:51 ` Andy Duan
2020-09-24 6:41 ` Sanchayan Maity
2020-09-24 8:54 ` Stefan Agner
2020-09-25 12:42 ` Jonathan Cameron
2020-10-02 14:10 ` Christian Eggers
2020-10-10 13:23 ` Jonathan Cameron
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