Re: Fwd: Adding timeouts to device access?

Hi,

I'm sorry to be late for reply, however I was traveling.

On Mon, Jun 23, 2025 at 05:53:47PM +1000, ‍小太 wrote:
> Hello, I tried sending an email (see below) to
> [email protected] a few days ago but it hasn't showed
> up on the archive:
> https://sourceforge.net/p/linux1394/mailman/linux1394-devel/?viewmonth=202506
> Is it awaiting moderation or got dropped as spam? Did I send it wrong?

The moderation of list is kind of outside what I usually deal with,
unforntunately. Additionally, the moderators of list is inactive so long.

> ---------- Forwarded message ---------
> From: ‍小太 <[email protected]>
> Date: Fri, 20 Jun 2025 at 19:23
> Subject: Re: Adding timeouts to device access?
> To: <[email protected]>
> 
> 
> On Fri, 20 Jun 2025 at 19:17, ‍小太 <[email protected]> wrote:
> 
> > Hello, I've been trying to debug an odd issue with my hardware where it
> > sometimes just stops responding (hardware failure is my guess at the
> > moment).
> > This resulted in hung tasks in the kernel that sometimes even prevents the
> > OS from cleanly shutting down
> >
> > In particular, I believe these lines are prone to hanging indefinitely in
> > the event the hardware fails to respond:
> >  -
> > https://github.com/torvalds/linux/blob/75f5f23f8787c5e184fcb2fbcd02d8e9317dc5e7/drivers/firewire/core-card.c#L753
> >  -
> > https://github.com/torvalds/linux/blob/75f5f23f8787c5e184fcb2fbcd02d8e9317dc5e7/drivers/firewire/core-transaction.c#L433
> >
> > Would it make sense to turn these into wait_for_completion_timeout() or
> > even wait_for_completion_interruptible_timeout() instead?
> > If so, some questions:
> >  - What would be a reasonable timeout value? 1 second? Less?
> >  - If fw_run_transaction() times out, what should it
> > return? RCODE_CANCELLED?
> >
> 
> Whoops, I was meant to include the hung task logs but forgot. Here they are
>
> (Snip)

Would I ask you the situation facing the issue? Especially, what kind of
1394 OHCI hardware you used.


Thanks

Takashi Sakamoto


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