the kernel i am using is 2.4.20. the code where i am using the timer is as follows:
this function is defined in:
/usr/src/linux 2.4.20-8/net/ipv4/tcp_input.c
static __inline__ void __tcp_ack_snd_check(struct sock *sk, int ofo_possible)
{
int i=0;
// pkt_cnt++;
struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
/* More than one full frame received... */
if (((tp->rcv_nxt - tp->rcv_wup) > tp->ack.rcv_mss
/* ... and right edge of window advances far enough.
* (tcp_recvmsg() will send ACK otherwise). Or...
*/
&& __tcp_select_window(sk) >= tp->rcv_wnd) ||
/* We ACK each frame or... */
tcp_in_quickack_mode(tp) ||
/* We have out of order data. */
(ofo_possible &&
skb_peek(&tp->out_of_order_queue) != NULL)&&(stop_ack==0)) {
pkt_cnt++;
if(pkt_cnt<10)
{
tcp_send_ack(sk);
}
else if(pkt_cnt == 10)
{
for(i=0;i<=10;i++)
{
dcount++;/*-----------modified for the timer from here----*/
init_timer(&my_timer);
my_timer.expires = jiffies + .01*HZ*i;
my_timer.data = "">
my_timer.function = (void *)timer_function;
add_timer(&my_timer);
/*---------------------------------modified till here -------*/
/*---- tcp_send_ack(sk);-----was called here in the original kernel---*/
}
stop_ack =1;
}
the timer is used in tcp_ack_snd_check as shown where the function to be executed after the expiration of time is tcp_send_ack(sk) which i have called in timer_function as follows:
void timer_function(unsigned long x)
{
printk("current time is %lu \n",jiffies);
struct sock *sk;
tcp_send_ack(sk);
del_timer(&my_timer);
//printk("this is timer_delay function\n");
}
as u said i used del_timer here!
for these modifications kernel compiles & boots successfully but when i run an application like FTP the kernel panics!
where i have gone wrong!
pls let me know!
On Wed, 01 Mar 2006 Abu M.Muttalib wrote :
> -----Original Message-----
> From: kernelnewbies-bounce@xxxxxxxxxxxx
>[mailto:kernelnewbies-bounce@xxxxxxxxxxxx]On Behalf Of kiran kumar
> Sent: Tuesday, February 28, 2006 1:11 PM
> To: Abu M.Muttalib
> Cc: kernelnewbies@xxxxxxxxxxxx
> Subject: Re: RE: timer_function+timer_list
>
>
> as for as i know there is no need to deactivate the timer!
> is it required to explicitly deactivate the timer!
> [Abu M Muttalib] Yes, as far as we have observed in kernel 2.6.13 version.
>On second run the driver was generating an OOPS. On first run it was all OK.
>Seems there is some issue with the "timer_base" in timer.c.
> if reqd where to deactivate the timer!
> [Abu M Muttalib] If you are using the timer function in some driver then
>you can deactivate timer inside the close/release call or at module unload
>time.
>
>
> On Tue, 28 Feb 2006 Abu M.Muttalib wrote :
> >Hi,
> >
> >Please see that you have used corresponding del_timer.
> >
> >~Abu
> >Abu M. Muttalib
> >Sr. Engineer, Embedded System,
> >Aftek Infosys Ltd.,
> >Pune, India
> >Office: 91-20-25449260-65 X-256
> >Mobile: (0)9881322820
> >Email: abum@xxxxxxxxx
> >
> >
> >
> > -----Original Message-----
> > From: kernelnewbies-bounce@xxxxxxxxxxxx
> >[mailto:kernelnewbies-bounce@xxxxxxxxxxxx]On Behalf Of kiran kumar
> > Sent: Monday, February 27, 2006 12:01 PM
> > To: kernelnewbies@xxxxxxxxxxxx
> > Subject: timer_function+timer_list
> >
> >
> > hi all,
> > i have used struct timer_list function in tcp_ack_snd_check() defined
>in
> >tcp_input.c to introduce the delay b/w acks!
> > the kernel compiled & booted successfully but when i run an application
> >like ftp the kernel panics giving the oops msg as follows:
> > (i am only listing the end portion of the oops)
> > code: 89 5a 04 89 13 89 43 04 89 18 5b c3 8d 76 00 81 f9 ff 3f 00
> > <0> kernel panic : Aiee, kernel interrupt handler !
> > In interrupt handler - not syncing!
> >
> > what might be the problem!
> >
> > earlier i used mdelay to introduce the delay, it worked fine!
> > but i want to use struvt timer_list function!
> >
> > pls help me in this regard!
> >
> >
> > warm regards,
> > kiran kumar s.k
> > N.I.T.K,surathkal
> >
> >
>
>
> warm regards,
> kiran kumar s.k
> N.I.T.K,surathkal
>
>
kiran kumar s.k
N.I.T.K,surathkal
