netdev - Re: [PATCH][VIA-RHINE]: Fix CONFIG_VIA_RHINE

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Date:	Wed, 22 Aug 2007 19:19:47 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH][VIA-RHINE]: Fix CONFIG_VIA_RHINE_NAPI usage

Em Wed, Aug 22, 2007 at 02:58:55PM -0700, David Miller escreveu:
> From: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> Date: Wed, 22 Aug 2007 18:46:59 -0300
> 
> > Hi David,
> > 
> > 	napi is broken here, with this patch at least I can isolate this
> > breakage and boot the machine with a non-napi via-rhine driver.
> > 
> 
> Thanks for finding this problem.
> 
> The core issue seems to be that via-rhine.c tries to perform
> a napi_enable() when there has not been a previous napi_disable().
> 
> So lets make sure that all paths that lead to an init_registers()
> call makes a preceeding napi_disable().
> 
> Please give this patch a try:

Tried with and without CONFIG_VIA_RHINE_NAPI, did stress testing with
netperf only with NAPI enabled. Works great


Signed-off-by: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
 
> diff --git a/drivers/net/via-rhine.c b/drivers/net/via-rhine.c
> index 8f4cf82..0e6aefe 100644
> --- a/drivers/net/via-rhine.c
> +++ b/drivers/net/via-rhine.c
> @@ -1167,6 +1167,7 @@ static int rhine_open(struct net_device *dev)
>  		free_irq(rp->pdev->irq, dev);
>  		return rc;
>  	}
> +	napi_disable(&rp->napi);
>  	alloc_rbufs(dev);
>  	alloc_tbufs(dev);
>  	rhine_chip_reset(dev);
> @@ -1195,6 +1196,8 @@ static void rhine_tx_timeout(struct net_device *dev)
>  	/* protect against concurrent rx interrupts */
>  	disable_irq(rp->pdev->irq);
>  
> +	napi_disable(&rp->napi);
> +
>  	spin_lock(&rp->lock);
>  
>  	/* clear all descriptors */
> @@ -1935,6 +1938,7 @@ static int rhine_suspend(struct pci_dev *pdev, pm_message_t state)
>  	if (!netif_running(dev))
>  		return 0;
>  
> +	napi_disable(&rp->napi);
>  	netif_device_detach(dev);
>  	pci_save_state(pdev);
>  
> -
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