netdev - Re: [PATCH 12/39] wimax: API call to reset a WiMAX device

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Date:	Thu, 27 Nov 2008 10:58:30 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Inaky Perez-Gonzalez <inaky@...ux.intel.com>
Cc:	netdev <netdev@...r.kernel.org>, Thomas Graf <tgraf@...g.ch>
Subject: Re: [PATCH 12/39] wimax: API call to reset a WiMAX device

On Wed, 2008-11-26 at 15:07 -0800, Inaky Perez-Gonzalez wrote:
> Provides wimax_reset() for the kernel to reset a wimax device as
> needed.
> 
> Exports wimax_reset() over generic netlink to user space.

> +struct genl_ops wimax_gnl_reset = {
> +	.cmd = WIMAX_GNL_OP_RESET,
> +	.flags = 0,

permission check again

> +       /* Execute the operation and send the result back to user space */
> +       result = wimax_reset(wimax_dev);
> +       result2 = wimax_gnl_send_rp_result(wimax_dev, info, result);
> +       if (result2 < 0)
> +               dev_err(dev, "WIMAX_GNL_RESET: can't send result %d to "
> +                       "userspace: %d\n", result, result2);
> +       result = 0;
> +       dev_put(wimax_dev->net_dev);
> +error_no_wimax_dev:
> +error_perm:
> +       d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
> +       return result;

This is strange. Can you show your corresponding userspace code? It
shouldn't be necessary with generic netlink to explicitly send the
result, if you just return the result from wimax_reset() it'll be part
of the ACK message and thus already be relayed to userspace. I think
you're not using genl correctly here.

johannes

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