Interrupt driver not going to the interrupt handler for dm355 processor

Hi,

       I wrote one driver code for Externel interrupt for IPNC processor dm355.When i am inserting the driver It is register in the /proc/interrupt but it is not going to the handler and also showing one

enable_irq(51) unbalanced from c006c574

If i removed the enable_irq the  error unbalanced its not coming but it is not going to the interrupt handler.I set the pin as input and arm no is also i correctly given i used the gpio no -7 and corresponding interrupt no is 51.

The diver code is here

/* add copyright notice here*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/bitops.h>
#include <linux/proc_fs.h>

#include <asm/irq.h>
#include <asm/io.h>
#include <asm/hardware/clock.h>

#include <asm/arch/irqs.h>
#include <asm/arch/hardware.h>
#include <asm/arch/gpio.h>
#include <asm/arch/cpu.h>

#include <asm/mach/irq.h>
#include <linux/delay.h>

#include<linux/interrupt.h>
#include<linux/delay.h>
#include<linux/sched.h>

MODULE_AUTHOR("Venkatesh");
MODULE_DESCRIPTION("GPIO kernel module for avench");
MODULE_LICENSE("GPL");

#define DAVINCI_SYSTEM_MODULE_BASE        (0x01C40000)
#define INT_NUMBER                              51
int x=3;

irqreturn_t gpio_handler(int irq,void *dev_id,struct pt_regs *regs);

int init_module (void) {
    unsigned int result;
    unsigned int a;
        void __iomem *pinmux3 = (void __iomem *) IO_ADDRESS(DAVINCI_SYSTEM_MODULE_BASE + 0x0c);  //pinmux pins are used as gpio
    
    printk("Entered into the init module\n");
    /* Configure the pin multiplexing to enable pin 7 & 17 */
    __raw_writel(0xEFFDFFFF, pinmux3);
    printk("pin mux initialiszed\n");

    gpio_direction_input(7);                                             //pin 7 set as input
    printk("Gpiovalue7=%d",gpio_get_value(7));
        a=gpio_get_value(7);
    gpio_direction_output(17,0);                                       //pin 17 set as output
    printk("Gpiovalue17=%d",gpio_get_value(17));

 
        
            /* Configure GPIO1 to generate an interrupt on high only */
          set_irq_type(INT_NUMBER, IRQT_HIGH);

 
    result=request_irq(INT_NUMBER,gpio_handler,SA_INTERRUPT,"gpio_intr_handler",NULL);
    
    

    
        if (result < 0) {
        printk(KERN_INFO "short: can't get assigned irq %i\n",INT_NUMBER);
    }else { // actually enable it -- assume this *is* a parallel port */
        //printk("Entered into the isr");
    }
    


        enable_irq(INT_NUMBER);
//return 0;

}


irqreturn_t gpio_handler(int irq,void *dev_id,struct pt_regs *regs){
    printk("Entered into the Interrupt routine\n");
    return 0;
}



void cleanup_module(void) {

    printk("Cleaning up interrupt driver \n");
    free_irq(INT_NUMBER,NULL);
}

Please any one help in this problem it will be very use full for me.

Thanks