linux-kernel - Re: [PATCH] r8169: Fix irq masking in rtl8169

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Message-ID: <49C00381.8050207@garzik.org>
Date:	Tue, 17 Mar 2009 16:09:37 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Karsten Wiese <fzu@...gehoertderstaat.de>
CC:	linux-kernel@...r.kernel.org, NetDev <netdev@...r.kernel.org>,
	Francois Romieu <romieu@...zoreil.com>
Subject: Re: [PATCH] r8169: Fix irq masking in rtl8169_interrupt()

Karsten Wiese wrote:
> Only adjust the NAPI bits of the interruptmask, if netif_rx_schedule_prep()
> returns true.
> Without this, I see interrupt storms here using 2.6.29-rcx and 2.6.27.19 and
> device needed rmmod r8169 + modprobe r8169 to start working.
> 
> Signed-off-by: Karsten Wiese <fzu@...gehoertderstaat.de>
> ---
>  drivers/net/r8169.c |    9 ++++-----
>  1 files changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
> index b347340..0c943ba 100644
> --- a/drivers/net/r8169.c
> +++ b/drivers/net/r8169.c
> @@ -3708,12 +3708,11 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
>  		rtl8169_check_link_status(dev, tp, ioaddr);
>  
>  	if (status & tp->napi_event) {
> -		RTL_W16(IntrMask, tp->intr_event & ~tp->napi_event);
> -		tp->intr_mask = ~tp->napi_event;
> -
> -		if (likely(netif_rx_schedule_prep(&tp->napi)))
> +		if (likely(netif_rx_schedule_prep(&tp->napi))) {
> +			RTL_W16(IntrMask, tp->intr_event & ~tp->napi_event);
> +			tp->intr_mask = ~tp->napi_event;
>  			__netif_rx_schedule(&tp->napi);
> -		else if (netif_msg_intr(tp)) {
> +		} else if (netif_msg_intr(tp)) {
>  			printk(KERN_INFO "%s: interrupt %04x in poll\n",


FWIW, you should CC net driver patches to netdev@...r.kernel.org, so 
that they get tracked in patchworks and handled by the right people.

	Jeff


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