linux-kernel - Re: [patch] net: dev

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Date:	Sat, 9 Dec 2006 10:59:52 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Andrew Morton <akpm@...l.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Alan <alan@...rguk.ukuu.org.uk>,
	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	ak@...e.de, Linus Torvalds <torvalds@...l.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [patch] net: dev_watchdog() locking fix

On Fri, Dec 08, 2006 at 03:19:02PM -0800, Andrew Morton wrote:
> 
> Like this?
> 
> 	/* don't get messages out of order, and no recursion */
> 	if (skb_queue_len(&npinfo->txq) == 0 &&
> 		    npinfo->poll_owner != smp_processor_id()) {
> 		local_bh_disable();	/* Where's netif_tx_trylock_bh()? */
> 		if (netif_tx_trylock(dev)) {
> 			/* try until next clock tick */
> 			for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
> 					tries > 0; --tries) {
> 				if (!netif_queue_stopped(dev))
> 					status = dev->hard_start_xmit(skb, dev);
> 
> 				if (status == NETDEV_TX_OK)
> 					break;
> 
> 				/* tickle device maybe there is some cleanup */
> 				netpoll_poll(np);
> 
> 				udelay(USEC_PER_POLL);
> 			}
> 			netif_tx_unlock(dev);
> 		}
> 		local_bh_enable();
> 	}

Looks good to me.  Thanks Andrew!
-- 
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