[PATCH] defxx: Use irqreturn_t for the interrupt handler

This is a fix for the interrupt handler in the defxx driver to use
irqreturn_t.  Beside the obvious fix of returning a proper status at all,
it actually checks board registers as appropriate for determining if an
interrupt has been recorded in the bus-specific interface logic.

The patch also includes an obvious one-line fix for SET_NETDEV_DEV needed
for the EISA variation, for which I've decided there is no point in sending
separately.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>

1 files changed, 51 insertions, 37 deletions

diff --git a/drivers/net/defxx.c b/drivers/net/defxx.c
index a6aa56598f2..5acd35c312a 100644
--- a/drivers/net/defxx.c
+++ b/drivers/net/defxx.c
@@ -191,6 +191,7 @@
  *              Feb 2001        davej           PCI enable cleanups.
  *              04 Aug 2003     macro           Converted to the DMA API.
  *              14 Aug 2004     macro           Fix device names reported.
+ *              14 Jun 2005     macro           Use irqreturn_t.
  */
 
 /* Include files */
@@ -217,8 +218,8 @@
 
 /* Version information string should be updated prior to each new release!  */
 #define DRV_NAME "defxx"
-#define DRV_VERSION "v1.07"
-#define DRV_RELDATE "2004/08/14"
+#define DRV_VERSION "v1.08"
+#define DRV_RELDATE "2005/06/14"
 
 static char version[] __devinitdata =
         DRV_NAME ": " DRV_VERSION " " DRV_RELDATE
@@ -247,7 +248,8 @@ static int		dfx_close(struct net_device *dev);
 static void             dfx_int_pr_halt_id(DFX_board_t *bp);
 static void             dfx_int_type_0_process(DFX_board_t *bp);
 static void             dfx_int_common(struct net_device *dev);
-static void             dfx_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static irqreturn_t      dfx_interrupt(int irq, void *dev_id,
+                                      struct pt_regs *regs);
 
 static struct           net_device_stats *dfx_ctl_get_stats(struct net_device *dev);
 static void             dfx_ctl_set_multicast_list(struct net_device *dev);
@@ -437,7 +439,8 @@ static int __devinit dfx_init_one_pci_or_eisa(struct pci_dev *pdev, long ioaddr)
         }
 
         SET_MODULE_OWNER(dev);
-        SET_NETDEV_DEV(dev, &pdev->dev);
+        if (pdev != NULL)
+                SET_NETDEV_DEV(dev, &pdev->dev);
 
         bp = dev->priv;
 
@@ -1225,7 +1228,7 @@ static int dfx_open(struct net_device *dev)
         
         /* Register IRQ - support shared interrupts by passing device ptr */
 
-        ret = request_irq(dev->irq, (void *)dfx_interrupt, SA_SHIRQ, dev->name, dev);
+        ret = request_irq(dev->irq, dfx_interrupt, SA_SHIRQ, dev->name, dev);
         if (ret) {
                 printk(KERN_ERR "%s: Requested IRQ %d is busy\n", dev->name, dev->irq);
                 return ret;
@@ -1680,13 +1683,13 @@ static void dfx_int_common(struct net_device *dev)
  * =================
  * = dfx_interrupt =
  * =================
- *   
+ *
  * Overview:
  *   Interrupt processing routine
- *  
+ *
  * Returns:
- *   None
- *       
+ *   Whether a valid interrupt was seen.
+ *
  * Arguments:
  *   irq        - interrupt vector
  *   dev_id     - pointer to device information
@@ -1699,7 +1702,8 @@ static void dfx_int_common(struct net_device *dev)
  *   structure context.
  *
  * Return Codes:
- *   None
+ *   IRQ_HANDLED - an IRQ was handled.
+ *   IRQ_NONE    - no IRQ was handled.
  *
  * Assumptions:
  *   The interrupt acknowledgement at the hardware level (eg. ACKing the PIC
@@ -1712,60 +1716,70 @@ static void dfx_int_common(struct net_device *dev)
  *   Interrupts are disabled, then reenabled at the adapter.
  */
 
-static void dfx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
-        {
+static irqreturn_t dfx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
         struct net_device       *dev = dev_id;
         DFX_board_t             *bp;    /* private board structure pointer */
-        u8                              tmp;    /* used for disabling/enabling ints */
 
         /* Get board pointer only if device structure is valid */
 
         bp = dev->priv;
 
-        spin_lock(&bp->lock);
-        
         /* See if we're already servicing an interrupt */
 
         /* Service adapter interrupts */
 
-        if (bp->bus_type == DFX_BUS_TYPE_PCI)
-                {
-                /* Disable PDQ-PFI interrupts at PFI */
+        if (bp->bus_type == DFX_BUS_TYPE_PCI) {
+                u32 status;
 
-                dfx_port_write_long(bp, PFI_K_REG_MODE_CTRL, PFI_MODE_M_DMA_ENB);
+                dfx_port_read_long(bp, PFI_K_REG_STATUS, &status);
+                if (!(status & PFI_STATUS_M_PDQ_INT))
+                        return IRQ_NONE;
 
-                /* Call interrupt service routine for this adapter */
+                spin_lock(&bp->lock);
+
+                /* Disable PDQ-PFI interrupts at PFI */
+                dfx_port_write_long(bp, PFI_K_REG_MODE_CTRL,
+                                    PFI_MODE_M_DMA_ENB);
 
+                /* Call interrupt service routine for this adapter */
                 dfx_int_common(dev);
 
                 /* Clear PDQ interrupt status bit and reenable interrupts */
-
-                dfx_port_write_long(bp, PFI_K_REG_STATUS, PFI_STATUS_M_PDQ_INT);
+                dfx_port_write_long(bp, PFI_K_REG_STATUS,
+                                    PFI_STATUS_M_PDQ_INT);
                 dfx_port_write_long(bp, PFI_K_REG_MODE_CTRL,
-                                        (PFI_MODE_M_PDQ_INT_ENB + PFI_MODE_M_DMA_ENB));
-                }
-        else
-                {
-                /* Disable interrupts at the ESIC */
+                                    (PFI_MODE_M_PDQ_INT_ENB |
+                                     PFI_MODE_M_DMA_ENB));
 
-                dfx_port_read_byte(bp, PI_ESIC_K_IO_CONFIG_STAT_0, &tmp);
-                tmp &= ~PI_CONFIG_STAT_0_M_INT_ENB;
-                dfx_port_write_byte(bp, PI_ESIC_K_IO_CONFIG_STAT_0, tmp);
+                spin_unlock(&bp->lock);
+        } else {
+                u8 status;
 
-                /* Call interrupt service routine for this adapter */
+                dfx_port_read_byte(bp, PI_ESIC_K_IO_CONFIG_STAT_0, &status);
+                if (!(status & PI_CONFIG_STAT_0_M_PEND))
+                        return IRQ_NONE;
 
+                spin_lock(&bp->lock);
+
+                /* Disable interrupts at the ESIC */
+                status &= ~PI_CONFIG_STAT_0_M_INT_ENB;
+                dfx_port_write_byte(bp, PI_ESIC_K_IO_CONFIG_STAT_0, status);
+
+                /* Call interrupt service routine for this adapter */
                 dfx_int_common(dev);
 
                 /* Reenable interrupts at the ESIC */
+                dfx_port_read_byte(bp, PI_ESIC_K_IO_CONFIG_STAT_0, &status);
+                status |= PI_CONFIG_STAT_0_M_INT_ENB;
+                dfx_port_write_byte(bp, PI_ESIC_K_IO_CONFIG_STAT_0, status);
 
-                dfx_port_read_byte(bp, PI_ESIC_K_IO_CONFIG_STAT_0, &tmp);
-                tmp |= PI_CONFIG_STAT_0_M_INT_ENB;
-                dfx_port_write_byte(bp, PI_ESIC_K_IO_CONFIG_STAT_0, tmp);
-                }
-
-        spin_unlock(&bp->lock);
+                spin_unlock(&bp->lock);
         }
 
+        return IRQ_HANDLED;
+}
+
 
 /*
  * =====================