static int rmnet_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct rmnet_private *p = netdev_priv(dev);
if (netif_queue_stopped(dev)) {
pr_err("[%s]fatal: rmnet_xmit called when "
"netif_queue is stopped", dev->name);
return 0;
}
if (!ul_is_connected) {
p->waiting_for_ul = 1;
msm_bam_dmux_kickoff_ul_wakeup();
return NETDEV_TX_BUSY;
}
_rmnet_xmit(skb, dev);
if (msm_bam_dmux_is_ch_full(p->ch_id)) {
netif_stop_queue(dev);
DBG0("%s: High WM hit, stopping queue=%p\n", __func__, skb);
}
return 0;
}
static int rmnet_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct rmnet_private *p = netdev_priv(dev);
unsigned long flags;
int awake;
int ret = 0;
if (netif_queue_stopped(dev)) {
pr_err("[%s]fatal: rmnet_xmit called when "
"netif_queue is stopped", dev->name);
return 0;
}
spin_lock_irqsave(&p->lock, flags);
awake = msm_bam_dmux_ul_power_vote();
if (!awake) {
/* send SKB once wakeup is complete */
netif_stop_queue(dev);
p->waiting_for_ul_skb = skb;
spin_unlock_irqrestore(&p->lock, flags);
ret = 0;
goto exit;
}
spin_unlock_irqrestore(&p->lock, flags);
ret = _rmnet_xmit(skb, dev);
if (ret == -EPERM) {
ret = NETDEV_TX_BUSY;
goto exit;
}
/*
* detected SSR a bit early. shut some things down now, and leave
* the rest to the main ssr handling code when that happens later
*/
if (ret == -EFAULT) {
netif_carrier_off(dev);
dev_kfree_skb_any(skb);
ret = 0;
goto exit;
}
if (ret == -EAGAIN) {
/*
* This should not happen
* EAGAIN means we attempted to overflow the high watermark
* Clearly the queue is not stopped like it should be, so
* stop it and return BUSY to the TCP/IP framework. It will
* retry this packet with the queue is restarted which happens
* in the write_done callback when the low watermark is hit.
*/
netif_stop_queue(dev);
ret = NETDEV_TX_BUSY;
goto exit;
}
spin_lock_irqsave(&p->tx_queue_lock, flags);
if (msm_bam_dmux_is_ch_full(p->ch_id)) {
netif_stop_queue(dev);
DBG0("%s: High WM hit, stopping queue=%p\n", __func__, skb);
}
spin_unlock_irqrestore(&p->tx_queue_lock, flags);
exit:
msm_bam_dmux_ul_power_unvote();
return ret;
}
