linux-kernel - Re: [openib-general] [PATCH 22 of 23] IB/ipath - print warning if LID not acquired within one minute

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Date:	Fri, 25 Aug 2006 13:40:51 -0700
From:	Robert Walsh <rjwalsh@...hscale.com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Bryan O'Sullivan <bos@...hscale.com>, linux-kernel@...r.kernel.org,
	openib-general@...nib.org
Subject: Re: [openib-general] [PATCH 22 of 23] IB/ipath - print warning if
 LID not acquired within one minute

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Roland Dreier wrote:
> 1) What makes ipath special so that we want this warning for ipath
> devices but not other IB hardware?

There's nothing special about our hardware that requires this.  We just
wanted that in there so we could direct customers to look at dmesg to
see if the warning popped up if they call with a problem.  It is useful
to have for this purpose.

> If this warning is actually
> useful, then I think it would make more sense to start a timer when
> any IB device is added, and warn if ports with a physical link don't
> become active after the timeout time.

I'd be OK with doing that, too.

> But I'm having a hard time
> seeing why we want this message in the kernel log.

It's useful when you're trying to track down problems.

> 2) You do cancel_delayed_work() but not flush_scheduled_work(), so
> it's possible for your timeout function to be running after the module
> text is gone.

OK - I'll fix this up.  Thanks for spotting it.

Regards,
 Robert.

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