netdev - RE:RE: is it useful testing __LINK_STATE_RX_SCHED in dev

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Date:	Wed, 21 Nov 2007 15:09:52 +0800
From:	<wyb@...sec.com.cn>
To:	<netdev@...r.kernel.org>
Cc:	"'Herbert Xu'" <herbert@...dor.apana.org.au>
Subject: RE:RE: is it useful testing __LINK_STATE_RX_SCHED in dev_close()?

__LINK_STATE_RX_SCHED still exist in kernel 2.6.23.8.

Netdevice.h:

/* Test if receive needs to be scheduled */
static inline int __netif_rx_schedule_prep(struct net_device *dev)
{
	return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
}

/* Test if receive needs to be scheduled but only if up */
static inline int netif_rx_schedule_prep(struct net_device *dev)
{
	return netif_running(dev) && __netif_rx_schedule_prep(dev);
}

Dev.c:
int dev_close(struct net_device *dev)
{
	...
	while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
     	/* No hurry. */
         msleep(1);
    }
	...
}

Test_bit() in dev_close() maybe between the calling of netif_running() and
__netif_rx_schedule_prep() in netif_rx_schedule_prep.

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