mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 16:12:02 +00:00
5003d0ce5c
With PREEMPT_RT enabled a spinlock_t becomes a sleeping lock.
This is usually not a problem with spinlocks used in IRQ context since
IRQ handlers get threaded. However, if IRQF_ONESHOT is set, the primary
handler won't be force-threaded and runs always in hardirq context. This is
a problem because spinlock_t requires a preemptible context on PREEMPT_RT.
In this particular instance, regmap mmio uses spinlock_t to protect the
register access and IRQF_ONESHOT is set on the IRQ. In this case, it is
actually better to do everything in threaded handler and it solves the
problem with PREEMPT_RT.
Reported-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
Closes: https://lore.kernel.org/linux-amlogic/20240729131652.3012327-1-avkrasnov@salutedevices.com
Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Fixes:
|
||
|---|---|---|
| .. | ||
| aiu-acodec-ctrl.c | ||
| aiu-codec-ctrl.c | ||
| aiu-encoder-i2s.c | ||
| aiu-encoder-spdif.c | ||
| aiu-fifo-i2s.c | ||
| aiu-fifo-spdif.c | ||
| aiu-fifo.c | ||
| aiu-fifo.h | ||
| aiu.c | ||
| aiu.h | ||
| axg-card.c | ||
| axg-fifo.c | ||
| axg-fifo.h | ||
| axg-frddr.c | ||
| axg-pdm.c | ||
| axg-spdifin.c | ||
| axg-spdifout.c | ||
| axg-tdm-formatter.c | ||
| axg-tdm-formatter.h | ||
| axg-tdm-interface.c | ||
| axg-tdm.h | ||
| axg-tdmin.c | ||
| axg-tdmout.c | ||
| axg-toddr.c | ||
| g12a-toacodec.c | ||
| g12a-tohdmitx.c | ||
| gx-card.c | ||
| Kconfig | ||
| Makefile | ||
| meson-card-utils.c | ||
| meson-card.h | ||
| meson-codec-glue.c | ||
| meson-codec-glue.h | ||
| t9015.c | ||