Hello,
Thanks for Venkat's response , but my system still crash.
Before I used the rtl_hard_enable_irq function, my system didn't crash
even if i returned 0.
I found that the following URL has an example .It uses the
rtl_hard_enable_irq
function , and returns 0,too.
http://www.linuxdevices.com/articles/AT8948080759.html
So...i still don't know why my system crashed :~
Here is my code :
#include <rtl.h>
#include <rtl_fifo.h>
#include <rtl_time.h>
#include <rtl_sched.h>
#include <rtl_sync.h>
#include <rtl_core.h>
#include "common.h"
#define IRQ1 4 // IRQ of device1 , eth0
unsigned int int_handler(unsigned int irq, struct pt_regs *regs)
{
long long t;
t = lrdtsc();
switch (irq) {
case IRQ1 :
rtf_put(0, &t, sizeof(t));
break;
default :
break;
}
rtl_hard_enable_irq(irq);
return 1; // it was 0 , now changes to 1 , but still crash
}
int init_module(void)
{
int ret;
if (rtf_create(0, 1024*sizeof(long long)) != 0)
rtl_printf("Fail to create fifo 0\n");
ret = rtl_request_irq(IRQ1, int_handler);
if (ret) {
rtl_printf("failed to get irq%d: %d\n", IRQ1, ret);
} else { rtl_printf("got irq%d\n", IRQ1); }
return 0;
}
void cleanup_module(void)
{
if (rtf_destroy(0) < 0)
rtl_printf("Fail to destroy fifo 0\n");
rtl_free_irq(IRQ1);
}
----- Original Message -----
From: "A V" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, April 15, 2002 12:20 PM
Subject: Re: [rtl] about rtl_hard_enable_irq
>
> U return 1 dont return 0. If u return 1 OS thinks that
> ur interrupt was handled. And if u return 0 OS thinks
> the interrupt is not handled and searches for suitable
> handler. But it fails and crashes.
>
> Regards
> Venkat
>
> --- �Τ� <[EMAIL PROTECTED]> wrote:
> > Hi,
> >
> > I got a problem with the rtl_hard_enable_irq
> > function.
> > When i put the function in a rtl interrupt
> > handler like this...
> >
> >
> > unsigned int int_handler(unsigned int irq, struct
> > pt_regs *regs)
> > {
> > long long t;
> > t = lrdtsc();
> > switch (irq) {
> > case IRQ1 :
> > rtl_hard_enable_irq(IRQ1);
> > rtf_put(0, &t, sizeof(t));
> > break;
> > case IRQ2 :
> > rtl_hard_enable_irq(IRQ2);
> > rtf_put(1, &t, sizeof(t));
> > break;
> >
> >
> > default :
> > break;
> > }
> > return 0;
> > }
> >
> > when there's an interrupt occur(IRQ1=4 , IRQ2=3
> > ), my system will
> > crash seriously. But if i don't use the
> > function. rtlinux will not receive
> > anymore interrupt(IRQ1 and IRQ2) before
> > rtl_global_pend_irq().
> >
> > I searched some others' codes, all of them put
> > the rtl_hard_enable_irq
> > in their interrupt handler. So i can not
> > understand why my system crashed.
> > Does anyone have the answer ?
> >
> > enviroment: redhat 7.0
> > kernel2.2.19-rtl
> > rtlinux-3.1
> > NIC Card IRQ : 4 and 3
> >
> >
> >
>
>
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