Eliav Farber 6bca1e9558 pps: clients: gpio: fix interrupt handling order in remove path ...

The interrupt handler in pps_gpio_probe() is registered after calling
pps_register_source() using devm_request_irq(). However, in the
corresponding remove function, pps_unregister_source() is called before
the IRQ is freed, since devm-managed resources are released after the
remove function completes.

This creates a potential race condition where an interrupt may occur
after the PPS source is unregistered but before the handler is removed,
possibly leading to a kernel panic.

To prevent this, switch from devm-managed IRQ registration to manual
management by using request_irq() and calling free_irq() explicitly in
the remove path before unregistering the PPS source. This ensures the
interrupt handler is safely removed before deactivating the PPS source.

Signed-off-by: Eliav Farber <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

2025-07-01 12:29:24 +02:00

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Kconfig

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Makefile

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pps_parport.c

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pps-gpio.c

pps: clients: gpio: fix interrupt handling order in remove path

2025-07-01 12:29:24 +02:00

pps-ktimer.c

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pps-ldisc.c

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