Re: Badness in local_bh_enable at kernel/softirq.c:140 with inet_stream

[linux-os (Dick Johnson)]

On Thu, 6 Apr 2006, jordi Vaquero wrote:

> Hello
>
> I'm trying to make a Linux Kernel module. My module has a network
> comunication with sockets, I use the functions like this skeleton,
>
>            sd = sock_create(AF_INET,SOCK_STREAM,IPPROTO_TCP,&sock);
>                if(sd<0){
>                printk(KERN_ERR "Error\n");
>            }else{
>                sout.sin_family = AF_INET;
>                err = inet_aton("172.16.151.1",&sout.sin_addr); //this
>        function works well, I implemented it.
>                sout.sin_port = htons(20000);
>                sd = sock->ops->connect(sock,(struct sockaddr*)&sout,
>        sizeof(sout),O_RDWR);
>                if(sd<0){
>                    printk(KERN_ERR "Error \n");
>                    sock_release(sock);
>                }else{
>                     USE SENDMSG and RECVMSG
>                        ...
>                        ...
>                        ...
>                   sock_release(sock);
>                }
>
> My problem is that sometimes, at some point near the connect function, a
> warning is launched and dmesg shows this:
>
[SNIPPED... Crap]

This has become a FAQ...
If you need to do this INSIDE the kernel, you need to do it from
a kernel thread. Otherwise, your socket is indistinguishable
from somebody else's open file descriptor. A file descriptor needs
a CONTEXT! The kernel doesn't have a CONTEXT! You need a process
to have a context, either a kernel thread or a user-mode task.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.15.4 on an i686 machine (5589.42 BogoMips).
Warning : 98.36% of all statistics are fiction, book release in April.
_


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