netdev - Re: [PATCH] tc35815: Remove a wrong netif_wake_queue() call which triggers BUG

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Date:	Sat, 20 Feb 2010 00:31:22 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, ralf.roesch@...gmbh.de
Subject: Re: [PATCH] tc35815: Remove a wrong netif_wake_queue() call which
 triggers BUG_ON

On Sat, 20 Feb 2010 00:13:58 +0900, Atsushi Nemoto <anemo@....ocn.ne.jp> wrote:
> @@ -1437,7 +1437,6 @@ static int tc35815_do_interrupt(struct net_device *dev, u32 status, int limit)
>  		/* Transmit complete. */
>  		lp->lstats.tx_ints++;
>  		tc35815_txdone(dev);
> -		netif_wake_queue(dev);
>  		if (ret < 0)
>  			ret = 0;
>  	}

BTY, it looks isa-skelton.c have same problem.

void net_tx(struct net_device *dev)
{
...
	if (netif_queue_stopped(dev) && ! tx_full(dev))
		netif_wake_queue(dev);
...
}

static irqreturn_t net_interrupt(int irq, void *dev_id)
{
...
	if (status & TX_INTR) {
		/* Transmit complete. */
		net_tx(dev);
		np->stats.tx_packets++;
		netif_wake_queue(dev);
	}
...
}


I suppose here is the far origin of the bug :)

---
Atsushi Nemoto
--
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