On Thu, Dec 12, 2013 at 08:32:36PM +0800, Wang Weidong wrote:
> when I modprobe sctp_probe, it failed with "FATAL: ". I found that
> sctp should load before sctp_probe register jprobe. So I add a
> sctp_setup_jprobe for loading 'sctp' when first failed to register
> jprobe, just do this similar to dccp_probe.
>
> Signed-off-by: Wang Weidong <wangweidong1@xxxxxxxxxx>
> ---
> net/sctp/probe.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/net/sctp/probe.c b/net/sctp/probe.c
> index 53c452e..cd9565a 100644
> --- a/net/sctp/probe.c
> +++ b/net/sctp/probe.c
> @@ -182,6 +182,17 @@ static struct jprobe sctp_recv_probe = {
> .entry = jsctp_sf_eat_sack,
> };
>
> +static __init int sctp_setup_jprobe(void)
> +{
> + int ret = register_jprobe(&sctp_recv_probe);
> +
> + if (ret) {
> + request_module("sctp");
> + ret = register_jprobe(&sctp_recv_probe);
> + }
> + return ret;
> +}
> +
> static __init int sctpprobe_init(void)
> {
> int ret = -ENOMEM;
> @@ -202,7 +213,7 @@ static __init int sctpprobe_init(void)
> &sctpprobe_fops))
> goto free_kfifo;
>
> - ret = register_jprobe(&sctp_recv_probe);
> + ret = sctp_setup_jprobe();
> if (ret)
> goto remove_proc;
>
> --
> 1.7.12
>
>
>
You need to check the return code of request_module. if sctp.ko doesn't exist,
you'll hit exactly the same problem.
You might consider also adding a MODULE_SOFTDEP macro in to the patch, so that
the dependency is clearly visible in userspace to modprobe.
Neil
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