Re: [PATCH v1 3/3] usb: typec: fusb302: Switch to threaded interrupt handler

张永波
2026-01-07T09:52:51Z

> Still ideally we would solve this in another way then
> switching to a threaded IRQ handler.
>
> As the commit message of the mei-vsc fix mentions
> the root cause of these errors is typically an interrupt
> chip driver which uses IRQF_NO_THREAD disabling the auto
> threading of all interrupt handlers in RT mode.
>
> So the first question here would be to see if that flag is
> used in the interrupt chip and if yes, is that flag really
> necessary ?
This is very similar to the issue addressed in commit 24b176d8827d
("drm/msm/dsi: Remove spurious IRQF_ONESHOT flag").
The IRQF_ONESHOT flag is preventing forced threading here.

In irq_setup_forced_threading(), the conversion to threaded interrupts
is explicitly skipped if any of the IRQF_NO_THREAD, IRQF_PERCPU,
or IRQF_ONESHOT flags are present. In this case, IRQF_ONESHOT
appears to be the reason.

Regards,
giraffesnn