[PATCH] via-rhine: change mdelay to msleep and remove from ISR path

Get rid of the mdelay call in rhine_disable_linkmon. The function
is called from the via-rhine versions of mdio_read and mdio_write.
Those functions are indirectly called from rhine_check_media and
rhine_tx_timeout, both of which can be called in interrupt context.

So, create tx_timeout_task and check_media_task as instances of struct
work_struct inside of rhine_private. Then, change rhine_tx_timeout to
invoke schedule_work for tx_timeout_task (i.e. rhine_tx_timeout_task),
moving the work to process context. Also, change rhine_error (invoked
from rhine_interrupt) to invoke schedule_work for check_media_task
(i.e. rhine_check_media_task), which simply calls rhine_check media
in process context. Finally, add a call to flush_scheduled_work in
rhine_close to avoid any resource conflicts with pending work items.

Signed-off-by: John W. Linville <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/net/via-rhine.c

···
 	u8 tx_thresh, rx_thresh;
 
 	struct mii_if_info mii_if;
+	struct work_struct tx_timeout_task;
+	struct work_struct check_media_task;
 	void __iomem *base;
 };
 
···
 static void mdio_write(struct net_device *dev, int phy_id, int location, int value);
 static int  rhine_open(struct net_device *dev);
 static void rhine_tx_timeout(struct net_device *dev);
+static void rhine_tx_timeout_task(struct net_device *dev);
+static void rhine_check_media_task(struct net_device *dev);
 static int  rhine_start_tx(struct sk_buff *skb, struct net_device *dev);
 static irqreturn_t rhine_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
 static void rhine_tx(struct net_device *dev);
···
 	if (rp->quirks & rqRhineI)
 		dev->features |= NETIF_F_SG|NETIF_F_HW_CSUM;
 
+	INIT_WORK(&rp->tx_timeout_task,
+		  (void (*)(void *))rhine_tx_timeout_task, dev);
+
+	INIT_WORK(&rp->check_media_task,
+		  (void (*)(void *))rhine_check_media_task, dev);
+
 	/* dev->name not defined before register_netdev()! */
 	rc = register_netdev(dev);
 	if (rc)
···
 		   ioaddr + ChipCmd1);
 }
 
+static void rhine_check_media_task(struct net_device *dev)
+{
+	rhine_check_media(dev, 0);
+}
+
 static void init_registers(struct net_device *dev)
 {
 	struct rhine_private *rp = netdev_priv(dev);
···
 	if (quirks & rqRhineI) {
 		iowrite8(0x01, ioaddr + MIIRegAddr);	// MII_BMSR
 
-		/* Can be called from ISR. Evil. */
-		mdelay(1);
+		/* Do not call from ISR! */
+		msleep(1);
 
 		/* 0x80 must be set immediately before turning it off */
 		iowrite8(0x80, ioaddr + MIICmd);
···
 }
 
 static void rhine_tx_timeout(struct net_device *dev)
+{
+	struct rhine_private *rp = netdev_priv(dev);
+
+	/*
+	 * Move bulk of work outside of interrupt context
+	 */
+	schedule_work(&rp->tx_timeout_task);
+}
+
+static void rhine_tx_timeout_task(struct net_device *dev)
 {
 	struct rhine_private *rp = netdev_priv(dev);
 	void __iomem *ioaddr = rp->base;
···
 	spin_lock(&rp->lock);
 
 	if (intr_status & IntrLinkChange)
-		rhine_check_media(dev, 0);
+		schedule_work(&rp->check_media_task);
 	if (intr_status & IntrStatsMax) {
 		rp->stats.rx_crc_errors += ioread16(ioaddr + RxCRCErrs);
 		rp->stats.rx_missed_errors += ioread16(ioaddr + RxMissed);
···
 	spin_unlock_irq(&rp->lock);
 
 	free_irq(rp->pdev->irq, dev);
+
+	flush_scheduled_work();
+
 	free_rbufs(dev);
 	free_tbufs(dev);
 	free_ring(dev);