Re: [PATCH v1] usb: typec: ucsi: allow retries of ucsi_resume_work

[Marco Crivellari]

Hi,

>+		if (++ucsi->resume_retries < 5) {
>+			queue_delayed_work(system_long_wq, &ucsi->resume_work,
>+					   msecs_to_jiffies(500));
>+			return;
>+		}

Just one thing about this (same applies to the other queue_delayed_work() calls).

queue_delayed_work() calls:

queue_delayed_work_on(WORK_CPU_UNBOUND,...)
    __queue_delayed_work(cpu, wq, dwork, delay)
        __queue_delayed_work(cpu,...)

That perform this check:

	if (likely(cpu == WORK_CPU_UNBOUND))
		add_timer_global(timer);
	else
		...

It means the timer used is global / unbound: when it fires it will enqueue
the work on the CPU where the timer is executed. The workqueue you're
using is per-CPU.

I guess locality is not needed for correctness here, because of that, so
you can replace that workqueue with system_dfl_long_wq. This is the
unbound version.

system_long_wq is scheduled for removal.

Thanks,

--

Marco Crivellari

SUSE Labs