netdev - Re: [PATCH 1/7] mlx4: Added interrupts test support

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Date:	Thu, 01 Oct 2009 22:27:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rdreier@...co.com
Cc:	yevgenyp@...lanox.co.il, netdev@...r.kernel.org
Subject: Re: [PATCH 1/7] mlx4: Added interrupts test support

From: Roland Dreier <rdreier@...co.com>
Date: Thu, 01 Oct 2009 20:32:08 -0700

> This feels like a pretty risky thing to do while the device might be
> handling all sorts of other traffic at the same time.  Are you sure
> there are no races you expose here?  Have you actually seen cases where
> the interrupt test during initialization works but then this test
> catches a problem?  (My experience has been that if any MSI-X interrupts
> work from a device, then they'll all work)

I would suggest only allowing the test while the interface is down.
That way the test has exclusive control of the IRQ.
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