kernel panic on interrupt?
I have written a kernel module to react on an external hardwareinterrupt that will occur at e.g. IRQ9line. The idea is then my
application code could wait for an interrupt (perform an
ioctl(WAIT_ON_INTERRUPT)) and react to it.
The basic structure of this module is given below:
MyModule.o
------------------
wait_queue_head_t int_queue;
__init initModule()
{
...
proper initialization, etc
..
//register the interrupt handler
request_irq(IRQ7,myHndlr, PORTNAME,NULL)
//initialize the queue head
init_waitqueue_head(&int_queue);
}
myHndlr()
{
//re-wake the interrupt if asleep
wake_up_interruptible(&int_queue);
}
myIoclt()
{
//re-init the queue head
init_waitqueue_head(&int_queue);
//now wait for the interrupt
interruptible_sleep_on(&int_queue);
}
And I compiled this module using proper flags such as _MODULE _KERNEL
etc....
I know the above module coupled with my application worked very well
with kernel 2.2.20.
PROBLEM
-------
When I recently moved to kernel 2.4.20, I get a kernel panic (Oops
screen dump) every time I get the interrupt occurring. Hence, when
interrupt occurs the trace jumps to myHndlr() and kernel panic occurs at
the point of wake_up_interruptible(&int_queue);
What could this be?
Why did the identical module worked for 2.2.20 and not for 2.4.20?? (I
made sure I used the proper lib for 2.4.20 when compiling the
MyModule.o)
I have noticed slight variation of the code in /kermel/sched.c between
2.2.20 & 2.4.20, where these functions wake_up_interruptible() etc) are
defined.
Could it also be as a result of implementation of softirq functions.
Should I enable Softirq?
I tried using cpu_raise_softirq() within MyModule.o. The module compiled
correct but when I load into the kernel, I get a lot of unresolved
symbols. What about ksoftirqd_CPU0, is this interfering with the system?
Any help in this matter is appreciated.
Regards, pure-blood kernel 2.4.20 ?
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