GPIO interrupts on mpc8313e

Yoni Levin yoni.l at
Thu Aug 2 18:37:14 EST 2007

Yes, I removed the flag (0) and nothing change in both cases the request_irq
return 0 which is good.
Then I added enable_irq and I recived :

Unbalanced enable for IRQ 74
------------[ cut here ]------------
Badness at c0043578 [verbose debug info unavailable]
Call Trace:
[C76C9D00] [C0008648] show_stack+0x48/0x194 (unreliable)
[C76C9D30] [C0139364] report_bug+0x84/0xac
[C76C9D40] [C000E398] program_check_exception+0xe0/0x538
[C76C9D80] [C000FE04] ret_from_except_full+0x0/0x4c
--- Exception: 700 at enable_irq+0x80/0xb0
    LR = enable_irq+0x80/0xb0
[C76C9E50] [C907423C] CreateGPIOHandler+0x28/0x7c [modexample]
[C76C9E70] [C9074728] init_module+0x2c/0x8c [modexample]
[C76C9E80] [C003B568] sys_init_module+0x1c4/0x165c
[C76C9F40] [C000F7BC] ret_from_syscall+0x0/0x38
--- Exception: c01 at 0xff311f0
    LR = 0x100316a8

By the way this is my code :

static irqreturn_t GPIOinterrupt_handler(int i,void *n,struct pt_regs *
	printk("GPIO recived and handled !!!!!!!!!!!!!!!!!!!...\n");
	return IRQ_HANDLED;	

void CreateGPIOHandler()

	unsigned int myirq=irq_create_mapping(NULL,74);
	printk("myirq is : %d \n",myirq);
	int ret;

	ret=- request_irq(74, GPIOinterrupt_handler,0, "GPIO", NULL);
	printk("ret is : %d \n",ret);


-----Original Message-----
From: Scott Wood [mailto:scottwood at] 
Sent: Wednesday, August 01, 2007 9:36 PM
To: Yoni Levin
Cc: linuxppc-embedded at
Subject: Re: GPIO interrupts on mpc8313e

On Wed, Aug 01, 2007 at 02:45:05PM +0300, Yoni Levin wrote:
> request_irq(74,handler,IRQF_DISABLED,"GPIO",NULL);

Did you try removing that flag (or calling enable_irq())?


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