Hi Mark,
Use Workqueues as a deferred procedure call and not the tasklet or softIRQ. SoftIRQs and tasklets cannot sleep.
Thumb rule is if the deferred work needs to sleep, worq queues are used.
--
Regards,
Gaurav Aggarwal
-----Original Message-----
From: kernelnewbies-bounce@xxxxxxxxxxxx
[mailto:kernelnewbies-bounce@xxxxxxxxxxxx]On Behalf Of Mark Ryden
Sent: Friday, February 23, 2007 1:58 PM
To: kernelnewbies@xxxxxxxxxxxx
Subject: Re: create a kernel socket from interrupt context
Hi,
Thanks, Topi.
I tried two things:
First , create a work queue and calling it from the interrupt.
what happens is that queue_work() fails. (The return value from
queue_work() is NOT 1 ).
So I looked into it and found that the problem is that I am in fact in
software interrupt context, not in hw interrupt context.
After looking for solutions and reading about this,I found out that
what I should use for software interrupts is a tasklet.
So I inserted taskets and the tasklet function is indeed called from
the software interrupt context.
The problem is that when I try to send a packet from a tasklet I have the same
error; "sleeping function called from invalid context".
Is there some way out of this ? I mean, to send packets from software
interrupt context ?
Regards,
Mark
On 2/22/07, Mark Ryden <markryde@xxxxxxxxx> wrote:
> Hello,
>
> Is it possible somehow to create a TCP socket from kernel and to send
> a message when you are in interrupt context ?
> I made a test : I created a kernel socket with
> sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)
> and then connected it with:
> sock->ops->connect(sock,
> (struct sockaddr*)&addr,
> sizeof(struct sockaddr), 0)
>
> When working NOT in interrupt context,it works OK; I called :
> kernel_sendmsg(sock, &msg, &iov, 1, length);
> and a TCP packet WAS sent (I verified it with a sniffer)
>
> BUT, in interrupt context, I called :
> kernel_sendmsg(sock, &msg, &iov, 1, length);
>
> I got:
> Feb 22 12:02:54 markhost kernel: BUG: sleeping function called from
> invalid context
> Feb 22 12:02:54 markhost: in_atomic():1, irqs_disabled():0
>
> Why is it so ? is there another way create a kernel TCP socket
> and to send a packet?
>
> Regards,
> Mark
>
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