[PATCH 0/2] iio: add IRQF_NO_THREAD to hardirq-only trigger helpers

[Runyu Xiao]

This series fixes two IIO trigger registration sites that pass
iio_trigger_generic_data_rdy_poll() to request_irq() without
IRQF_NO_THREAD.

Both sites are intended to drive iio_trigger_poll() from hardirq
context, but under forced IRQ threading they can otherwise run through
irq/... thread context instead.

This issue was first flagged by our static analysis tool while scanning
request_irq() sites that register iio_trigger_generic_data_rdy_poll(),
then manually audited on Linux v6.18.21.

It was further validated with a no-device QEMU selftest using irq_sim
to model a parent IRQ and a child IIO trigger IRQ under threadirqs. The
same trigger path ran from irq/... thread context without IRQF_NO_THREAD
and stayed in hardirq context after adding IRQF_NO_THREAD. The selftest
logged:

  3395 selftest: phase=bad current=irq/30-patchpar in_hardirq=0
  3395 selftest: phase=fixed current=swapper/0 in_hardirq=1
  3395 selftest: validation succeeded

Patch 1 fixes the ADIS non-FIFO managed trigger path.
Patch 2 fixes the BMI160 data-ready trigger path.

Build-tested by compiling adis_trigger.o and bmi160_core.o.

No ADIS or BMI160 hardware was available for end-to-end runtime testing
on this submission branch.

Runyu Xiao (2):
  iio: imu: adis: add IRQF_NO_THREAD to non-FIFO trigger IRQ
  iio: imu: bmi160: add IRQF_NO_THREAD to data-ready trigger IRQ

 drivers/iio/imu/adis_trigger.c       | 3 +--
 drivers/iio/imu/bmi160/bmi160_core.c | 3 ++-
 2 files changed, 3 insertions(+), 3 deletions(-)

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2.34.1