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

[jordi Vaquero <jordi.vaquero@gmail.com>]

Hello,
First of all, thanks for reply me, but I'm so sorry I not understand
your advice. I'm trying to do a disk driver that connect with a server
using tcp/ip sockets.
I don't understand why the context is the problem I have.
I'm looking for it deeply and I find thaht local_bh_enable is used in
networks, scsi drivers for enable bottom halves.
Sorry if this its in  FAQs, but I don't find it.
Thanks for advance
jordi


On 4/6/06, *linux-os (Dick Johnson)* <linux-os@analogic.com
<mailto:linux-os@analogic.com>> wrote:


    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
    <http://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 <http://2.6.15.4> on an i686
    machine (5589.42 BogoMips).
    Warning : 98.36% of all statistics are fiction, book release in April.
    _
    \x1a\x04

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