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Date:	Sat, 17 May 2014 21:33:07 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Amir Vadai <amirv@...lanox.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Yuval Atias <yuvala@...lanox.com>
Subject: Re: [PATCH net-next 1/9] net/mlx4_core: Enforce irq affinity
 changes immediatly

On Mon, 2014-05-12 at 10:43 +0300, Amir Vadai wrote:
> From: Yuval Atias <yuvala@...lanox.com>
> 
> During heavy traffic, napi is constatntly polling the complition queue
> and no interrupt is fired. Because of that, changes to irq affinity are
> ignored until traffic is stopped and resumed.
> 
> By registering to the irq notifier mechanism, and forcing interrupt when
> affinity is changed, irq affinity changes will be immediatly enforced.
[...]

This somewhat breaks ARFS in your driver, as that depends on IRQ
affinity notification.

It is also not safe to put an IRQ affinity notification function in a
module currently, as the work item for notification doesn't carry a
module reference and could be called after the module is removed.

Ben.

-- 
Ben Hutchings
I'm not a reverse psychological virus.  Please don't copy me into your sig.

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