[ATM]: [fore200e] make use tasklet configurable

drivers/atm/Kconfig

@@ -385,6 +385,15 @@ config ATM_FORE200E_SBA_FW
 	  not have to supply an alternative one. They just say Y to "Use
 	  default SBA-200E firmware", above.
 
+config ATM_FORE200E_USE_TASKLET
+	bool "Defer interrupt work to a tasklet"
+	depends on (PCI || SBUS) && (ATM_FORE200E_PCA || ATM_FORE200E_SBA)
+	default n
+	help
+	  This defers work to be done by the interrupt handler to a
+	  tasklet instead of hanlding everything at interrupt time.  This
+	  may improve the responsive of the host.
+
 config ATM_FORE200E_TX_RETRY
 	int "Maximum number of tx retries"
 	depends on (PCI || SBUS) && (ATM_FORE200E_PCA || ATM_FORE200E_SBA)

drivers/atm/fore200e.c

@@ -55,7 +55,7 @@
 #include <asm/pgtable.h>
 #endif
 
-#if 0 /* defer interrupt work to a tasklet */
+#if defined(CONFIG_ATM_FORE200E_USE_TASKLET) /* defer interrupt work to a tasklet */
 #define FORE200E_USE_TASKLET
 #endif
 
@@ -1354,6 +1354,7 @@ fore200e_rx_irq(struct fore200e* fore200e)
 }
 
 
+#ifndef FORE200E_USE_TASKLET
 static void
 fore200e_irq(struct fore200e* fore200e)
 {
@@ -1367,6 +1368,7 @@ fore200e_irq(struct fore200e* fore200e)
     fore200e_tx_irq(fore200e);
     spin_unlock_irqrestore(&fore200e->q_lock, flags);
 }
+#endif
 
 
 static irqreturn_t