netdev - Re: [PCNET32] Lock solid with netconsole

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Message-Id: <JIQ1PB$BBCF1554D3E697155C981E9F1E1E066A@laposte.net>
Date:	Mon, 28 May 2007 00:41:35 +0200
From:	Emmanuel Fusté <emmanuel.fuste@...oste.net>
To:	"romieu" <romieu@...zoreil.com>
Cc:	"tsbogend" <tsbogend@...ha.franken.de>,
	"pcnet32" <pcnet32@...izon.net>, "netdev" <netdev@...r.kernel.org>
Subject: Re: [PCNET32] Lock solid with netconsole

Ok will try and report the result.
Thanks.
> Emmanuel Fusté <emmanuel.fuste@...oste.net> :
> [...]
> > Just to let you know that I swap my pcnet32 with a via-rhine
> > and I no longer experienced hard machine lock after loading
> > netconsole.
> 
> Any difference if you disable the debug messages in the pcnet32
> driver and you apply the patch below ?
> 
> diff --git a/drivers/net/pcnet32.c b/drivers/net/pcnet32.c
> index 9c171a7..be4513f 100644
> --- a/drivers/net/pcnet32.c
> +++ b/drivers/net/pcnet32.c
> @@ -2556,11 +2556,12 @@ pcnet32_interrupt(int irq, void *dev_id)
>  	unsigned long ioaddr;
>  	u16 csr0;
>  	int boguscnt = max_interrupt_work;
> +	unsigned long flags;
>  
>  	ioaddr = dev->base_addr;
>  	lp = netdev_priv(dev);
>  
> -	spin_lock(&lp->lock);
> +	spin_lock_irqsave(&lp->lock, flags);
>  
>  	csr0 = lp->a.read_csr(ioaddr, CSR0);
>  	while ((csr0 & 0x8f00) && --boguscnt >= 0) {
> @@ -2632,7 +2633,7 @@ pcnet32_interrupt(int irq, void *dev_id)
>  		printk(KERN_DEBUG "%s: exiting interrupt, csr0=%#4.4x.\n",
>  		       dev->name, lp->a.read_csr(ioaddr, CSR0));
>  
> -	spin_unlock(&lp->lock);
> +	spin_unlock_irqrestore(&lp->lock, flags);
>  
>  	return IRQ_HANDLED;
>  }
> 

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