[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 <linville@tuxdriver.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 31 insertions, 3 deletions

diff --git a/drivers/net/via-rhine.c b/drivers/net/via-rhine.c
index e7b4bc3820e..24187158928 100644
--- a/drivers/net/via-rhine.c
+++ b/drivers/net/via-rhine.c
@@ -490,6 +490,8 @@ struct rhine_private {
         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;
 };
 
@@ -497,6 +499,8 @@ static int  mdio_read(struct net_device *dev, int phy_id, int location);
 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);
@@ -851,6 +855,12 @@ static int __devinit rhine_init_one(struct pci_dev *pdev,
         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)
@@ -1077,6 +1087,11 @@ static void rhine_check_media(struct net_device *dev, unsigned int init_media)
                    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);
@@ -1130,8 +1145,8 @@ static void rhine_disable_linkmon(void __iomem *ioaddr, u32 quirks)
         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);
@@ -1221,6 +1236,16 @@ static int rhine_open(struct net_device *dev)
 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;
 
         printk(KERN_WARNING "%s: Transmit timed out, status %4.4x, PHY status "
@@ -1626,7 +1651,7 @@ static void rhine_error(struct net_device *dev, int intr_status)
         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);
@@ -1874,6 +1899,9 @@ static int rhine_close(struct net_device *dev)
         spin_unlock_irq(&rp->lock);
 
         free_irq(rp->pdev->irq, dev);
+
+        flush_scheduled_work();
+
         free_rbufs(dev);
         free_tbufs(dev);
         free_ring(dev);