netdev - Re: [PATCH 4/6] forcedeth: Acknowledge only interrupts that are being processed

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Date:	Thu, 19 May 2011 02:35:39 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Decotigny <decot@...gle.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Joe Perches <joe@...ches.com>,
	Szymon Janc <szymon@...c.net.pl>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-net-upstream@...gle.com,
	Mike Ditto <mditto@...gle.com>
Subject: Re: [PATCH 4/6] forcedeth: Acknowledge only interrupts that are
 being processed

On Wed, 2011-05-18 at 17:14 -0700, David Decotigny wrote:
> From: Mike Ditto <mditto@...gle.com>
> 
> This is to avoid a race, accidentally acknowledging an interrupt that
> we didn't notice and won't immediately process.  This is based solely
> on code inspection; it is not known if there was an actual bug here.
> 
> 
> Signed-off-by: David Decotigny <decot@...gle.com>
> ---
>  drivers/net/forcedeth.c |   13 ++++++++-----
>  1 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
> index 7a6aa08..17e79de 100644
> --- a/drivers/net/forcedeth.c
> +++ b/drivers/net/forcedeth.c
> @@ -3403,7 +3403,8 @@ static irqreturn_t nv_nic_irq_tx(int foo, void *data)
>  
>  	for (i = 0;; i++) {
>  		events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQ_TX_ALL;
> -		writel(NVREG_IRQ_TX_ALL, base + NvRegMSIXIrqStatus);
> +		writel(events, base + NvRegMSIXIrqStatus);
> +		netdev_dbg(dev, "%s: tx irq: %08x\n", dev->name, events);
[...]

netdev_dbg() and related logging functions already include the device
name, too. :-)

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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