netdev - RE: [PATCH] igb: completely disable interrupts during netpoll

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Message-ID: <36D9DB17C6DE9E40B059440DB8D95F52057B3B27@orsmsx418.amr.corp.intel.com>
Date:	Wed, 25 Jun 2008 13:29:19 -0700
From:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
To:	"Andy Gospodarek" <andy@...yhouse.net>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>
Cc:	<netdev@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: RE: [PATCH] igb: completely disable interrupts during netpoll

Andy Gospodarek wrote:
> Globally disable the interrupt during netpoll rather than simply
> disabling it on the hardware.  This will ensure all pending operations
> are complete and no more will execute.  I've seen reports of deadlocks
> with the current driver and this patch resolves them.

I agree this patch is probably okay, and if it fixes a specific problem
should be accepted however I have a question that didn't apply when we
originally created code like this.

> @@ -4024,7 +4024,7 @@ static void igb_netpoll(struct net_device
>  	*netdev) int i;
>  	int work_done = 0;
> 
> -	igb_irq_disable(adapter);
> +	disable_irq(adapter->pdev->irq);

how does changing to disable_irq/enable_irq work with MSI and MSI-X
interrupts?
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