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Old 01-25-2010, 04:01 PM   #1
agaurav
LQ Newbie
 
Registered: Jan 2010
Posts: 1

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Device driver: Badness in irq_manage


Dear All,

I am a newbie to Linux. I am writing a device driver for a customer chip that will be controller by a host CPU running Linux. The hardware generates interrupts that I am trying to handle in software. I wrote a simplistic interrupt handler and it seems to work just fine but the kernel device driver does report errors on the console which bothers me. Any advise what may be the root cause or how I can debug this?

The error reported is as follows for the code given below. Any
pointers really appreciated. Thanks.

Gaurav

Code:
request succeeded for 30
Badness in enable_irq at kernel/irq/manage.c:106
Call trace:
 [c0005520] dump_stack+0x18/0x28
 [c00036f0] check_bug_trap+0x80/0xa4
 [c00037c4] ProgramCheckException+0xb0/0xe0
 [c0002df8] ret_from_except_full+0x0/0x4c
 [c00332c8] enable_irq+0xa0/0xa8
 [c9004928] ebc_open+0x1f8/0x3fc [ebc]
 [c005f34c] chrdev_open+0xf0/0x184
 [c0054204] dentry_open+0x164/0x26c
 [c005409c] filp_open+0x68/0x6c
 [c005458c] sys_open+0x68/0xa4
 [c0002780] ret_from_syscall+0x0/0x48
enable irq done

This happens in the following code fragment:

Code:
int my_open (struct inode *inode, struct file *filp){

....
....
	  /* register interrupt */
	  result = request_irq (MY_IRQ_NUM,my_irq_handler,SA_INTERRUPT,"me",NULL);
	  if (result){
		PRINTK(1, "my interrupt can't be assigned\n");
		my_release (inode,filp);
		return (-1);
	  }
          printk("request succeeded for %d\n", MY_IRQ_NUM);
	  /* enable vync interrupt */
	  enable_irq(VSYNC_IRQ_NUM); <--- problem happens here
          printk("enable irq done\n");
....
....
 
  


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