linux-kernel - Re: Userspace - Kernel Space "Connector" test

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Date:	Wed, 23 Apr 2008 13:49:46 +0530
From:	"Midhun A" <midhunagni@...il.com>
To:	"Evgeniy Polyakov" <johnpol@....mipt.ru>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Userspace - Kernel Space "Connector" test

Hey,

I had changed the group number. It worked ! Thanks a lot for the help
and also also the code !

Regards,
Midhun

On Mon, Apr 21, 2008 at 4:13 PM, Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> Hi.
>
>
>
>  On Mon, Apr 21, 2008 at 03:59:32PM +0530, Midhun A (midhunagni@...il.com) wrote:
>  > static void imxmci_check_status(unsigned long data)
>  > {
>  >       struct imxmci_host *host = (struct imxmci_host *)data;
>  >
>  >       /*Netlink*/
>  >       struct cn_msg *m;
>  >       char cn_data[32] = "SD/MMC Card Status";
>  >       /*Netlink*/
>  >
>  >       if( host->pdata->card_present() != host->present ) {
>  >               host->present ^= 1;
>  >               dev_info(mmc_dev(host->mmc), "card %s\n",
>  >                     host->present ? "inserted" : "removed");
>  >
>  >       /*Netlink*/
>  >
>  >       m = kmalloc(sizeof(*m) + sizeof(cn_data), GFP_ATOMIC);
>  >
>  >       if (m) {
>  >               printk("Inside if\n");
>  >               memset(m, 0, sizeof(*m) + sizeof(cn_data));
>  >               memcpy(&m->id, &cn_test_id, sizeof(m->id));
>  >               m->seq = cn_test_timer_counter;
>  >               m->len = sizeof(cn_data);
>  >
>  >               m->len =
>  >                   scnprintf(cn_data, sizeof(cn_data), "counter = %u",
>  >                             cn_test_timer_counter) + 1;
>  >
>  >               memcpy(m + 1, data, m->len);
>  >               printk("Copied Message\n");
>  >               cn_netlink_send(m, 0, gfp_any());
>  >               printk("Sent Message\n");
>  >               kfree(m);
>
>  What is return value here?
>  Also, do you register this driver as connector user? If not, you can not
>  use 0 group number, since it will search only for registered kernel
>  side, and if there was no registration, it can not obtain address of the
>  userspace side. You can specify group (7 in your cae) as a parameter
>  instead.
>
>  I suppose userspace was bound to (1<<7) group number or was subscribed
>  using socket option to 7'th group.
>
>  --
>         Evgeniy Polyakov
>
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