--- a/me8100.c	Fri Jan 18 20:45:23 2002 +0100
+++ b/me8100.c	Fri Jan 18 21:00:56 2002 +0100
@@ -606,7 +606,8 @@
 
     if (0 == subinfo->num_writer++) {
       subinfo->ctrl_reg |= ME8100_CTRL_ENIO | ME8100_CTRL_SOURCE;
-      PDEBUG("*** adding ENIO+SOURCE mode: ctrl: 0x%x\n", subinfo->ctrl_reg);
+      PDEBUG("*** adding %0x to ctrl: 0x%04x\n",
+	ME8100_CTRL_ENIO | ME8100_CTRL_SOURCE, subinfo->ctrl_reg);
       outw(subinfo->ctrl_reg, subinfo->regbase + ME8100_CTRL_REG);
     }
   }
@@ -622,38 +623,44 @@
 
     PDEBUG("*** open for reading\n");
 
-    if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {	  
-      printk(KERN_ERR"ME8100:me8100_open: kmalloc() failed.\n");
-      me8100_release(inode_ptr, file_ptr); 
-      return -EIO;
-    }
+    if (0 == subinfo->num_reader++) {
+      
+      PDEBUG("*** first reader...\n");
+
+      if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {	  
+	printk(KERN_ERR"ME8100:me8100_open: kmalloc() failed.\n");
+	me8100_release(inode_ptr, file_ptr); 
+	return -EIO;
+      }
 
-    priv->last_read = 0;
-    file_ptr->private_data = priv;
+      priv->last_read = 0;
+      file_ptr->private_data = priv;
 
-    /* Now we've to setup the IRQ line.  We suppose that it should be done
-     * in "mask" manner.  If somebody wishes to do it the otherway or if somebody
-     * wants to change the mask, ioctl() should be used. */
-    {
-      int mask = 0xffff;
-      unsigned short icsr = PCI_INT_EN | ((LOCAL_INT_EN | LOCAL_INT_POL) << (3 * subdevice)); 
+      /* Now we've to setup the IRQ line.  We suppose that it should be done
+       * in "mask" manner.  If somebody wishes to do it the otherway or if somebody
+       * wants to change the mask, ioctl() should be used. */
+      {
+	int mask = 0xffff;
+	unsigned short icsr = PCI_INT_EN | ((LOCAL_INT_EN | LOCAL_INT_POL) << (3 * subdevice)); 
 
 
-      /* 1) setup the PLX register */
-      PDEBUG("*** plx = 0x%0x\n", icsr);
-      outb(icsr, info->plx_regbase + PLX_ICSR);
+	/* 1) setup the PLX register */
+	PDEBUG("*** plx = 0x%0x\n", icsr);
+	outb(icsr, info->plx_regbase + PLX_ICSR);
 
-      /* 2) setup the irq flags in regbase */
-      subinfo->ctrl_reg |= ME8100_CTRL_IRQ_MASK;
-      PDEBUG("*** ctrl = 0x%04x\n", subinfo->ctrl_reg);
-      outw(subinfo->ctrl_reg, subinfo->regbase + ME8100_CTRL_REG);
+	/* 2) setup the irq flags in regbase */
+	subinfo->ctrl_reg |= ME8100_CTRL_IRQ_MASK;
+	PDEBUG("*** adding %0x to ctrl: 0x%04x\n", ME8100_CTRL_IRQ_MASK, 
+	  subinfo->ctrl_reg);
+	outw(subinfo->ctrl_reg, subinfo->regbase + ME8100_CTRL_REG);
 
-      /* 3) setup the interrupt mask */
-      PDEBUG("*** irqmask = 0x%04x\n", mask);
-      outw(mask, subinfo->regbase + ME8100_MASK_REG);
+	/* 3) setup the interrupt mask */
+	PDEBUG("*** irqmask = 0x%04x\n", mask);
+	outw(mask, subinfo->regbase + ME8100_MASK_REG);
 
-    }
-  }    
+      }
+    } /* first reader */
+  } /* reader */    
 
 
   return 0;
@@ -705,11 +712,22 @@
     PDEBUG("*** writer closes\n");
     if (0 == --subinfo->num_writer) {
 	subinfo->ctrl_reg &= !ME8100_CTRL_ENIO;
-	// PDEBUG("*** resetting ENIO mode ctrl: 0x%x\n", subinfo->ctrl_reg);
-	// outw(subinfo->ctrl_reg, subinfo->regbase + ME8100_CTRL_REG);
+	PDEBUG("*** resetting ENIO mode ctrl: 0x%x\n", subinfo->ctrl_reg);
+	outw(subinfo->ctrl_reg, subinfo->regbase + ME8100_CTRL_REG);
     }
   }
 
+  if (file_ptr->f_mode & FMODE_READ) {
+    PDEBUG("*** reader close\n");
+    if (0 == --subinfo->num_reader) {
+      PDEBUG("*** last reader...\n");
+      subinfo->ctrl_reg &= !ME8100_CTRL_IRQ_MASK; /* 11 */
+      PDEBUG("*** resetting IRQ mode ctrl: 0x%x\n", subinfo->ctrl_reg);
+      outw(subinfo->ctrl_reg, subinfo->regbase + ME8100_CTRL_REG);
+     }
+  }
+
+
   /* resetting the board on last close */
 
   if (--info->board_in_use == 0) {

--- a/me8100.h	Fri Jan 18 20:45:23 2002 +0100
+++ b/me8100.h	Fri Jan 18 21:00:56 2002 +0100
@@ -206,6 +206,7 @@
   unsigned short ctrl_reg;
   unsigned long last_change;
   int num_writer;
+  int num_reader;
 };
 
 typedef struct{

--- a/me8100_test_int/test.c	Fri Jan 18 20:45:23 2002 +0100
+++ b/me8100_test_int/test.c	Fri Jan 18 21:00:56 2002 +0100
@@ -52,10 +52,10 @@
 
   printf("IRQ Test %d\n", getpid());
 
-  file_handle = open("/dev/me8100_0", O_RDWR, 0);
+  file_handle = open("/dev/me8100_0a", O_RDONLY, 0);
 
   if(file_handle < 0){
-    printf("Cannot open path !\n");
+    perror("Can't open path");
     return 1;
   }