Hi Scoot,
When I try to use a atomic varaible in my ISR I see a kernel crash . with
mesage BUG: scheduling while atomic:
Below is the code :
My ISR
irqreturn_t cpld_irq_handler(int irq, void * dev_id, struct pt_regs *regs)
{
wake_up(&cpld_intr_wait);
atomic_inc(&cpld_intr_data); /* incrementing this will indicate the poll() that
the interrupt is occured */
return 0;
}
DRIVER_INIT
static int __init gpio_init(void)
{
int ret = 0;
int virq;
atomic_set(&cpld_intr_data, 0); /* initialize the
Interrupt indicator */
init_waitqueue_head(&cpld_intr_wait); /* Initialize the wait
queue */
virq = irq_create_mapping(NULL, CPLD1_INTERRUPT);
if ((ret = request_irq(virq,cpld_irq_handler, 0, GPIO_CHAR_PATH, NULL))!=0)
{
printk(KERN_ERR "gpio_init: Could not grab IRQ line for CPLD ret =
%d\n",ret);
goto err1;
}
if((s_nGPIOMajor = register_chrdev(MPC8247_DEVICE_MAJOR_NUM,
GPIO_CHAR_PATH, &gpio_fops))<0)
{
GPIO_DBG2("GPIO_DRIVER : unable to get major %d\n",
s_nGPIOMajor);
return s_nGPIOMajor;
}else{
GPIO_DBG2("GPIO_DRIVER : major = %x\n", s_nGPIOMajor );
}
return 0;
}
Regards,
Smitha
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