/* * Linux WiMAX * Implement and export a method for resetting a WiMAX device * * * Copyright (C) 2008 Intel Corporation <linux-wimax@intel.com> * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. * * * This implements a simple synchronous call to reset a WiMAX device. * * Resets aim at being warm, keeping the device handles active; * however, when that fails, it falls back to a cold reset (that will * disconnect and reconnect the device). */ #include <net/wimax.h> #include <net/genetlink.h> #include <linux/wimax.h> #include <linux/security.h> #include <linux/export.h> #include "wimax-internal.h" #define D_SUBMODULE op_reset #include "debug-levels.h" /** * wimax_reset - Reset a WiMAX device * * @wimax_dev: WiMAX device descriptor * * Returns: * * %0 if ok and a warm reset was done (the device still exists in * the system). * * -%ENODEV if a cold/bus reset had to be done (device has * disconnected and reconnected, so current handle is not valid * any more). * * -%EINVAL if the device is not even registered. * * Any other negative error code shall be considered as * non-recoverable. * * Description: * * Called when wanting to reset the device for any reason. Device is * taken back to power on status. * * This call blocks; on successful return, the device has completed the * reset process and is ready to operate. */ int wimax_reset(struct wimax_dev *wimax_dev) { int result = -EINVAL; struct device *dev = wimax_dev_to_dev(wimax_dev); enum wimax_st state; might_sleep(); d_fnstart(3, dev, "(wimax_dev %p)\n", wimax_dev); mutex_lock(&wimax_dev->mutex); dev_hold(wimax_dev->net_dev); state = wimax_dev->state; mutex_unlock(&wimax_dev->mutex); if (state >= WIMAX_ST_DOWN) { mutex_lock(&wimax_dev->mutex_reset); result = wimax_dev->op_reset(wimax_dev); mutex_unlock(&wimax_dev->mutex_reset); } dev_put(wimax_dev->net_dev); d_fnend(3, dev, "(wimax_dev %p) = %d\n", wimax_dev, result); return result; } EXPORT_SYMBOL(wimax_reset); /* * Exporting to user space over generic netlink * * Parse the reset command from user space, return error code. * * No attributes. */ int wimax_gnl_doit_reset(struct sk_buff *skb, struct genl_info *info) { int result, ifindex; struct wimax_dev *wimax_dev; d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info); result = -ENODEV; if (info->attrs[WIMAX_GNL_RESET_IFIDX] == NULL) { pr_err("WIMAX_GNL_OP_RFKILL: can't find IFIDX attribute\n"); goto error_no_wimax_dev; } ifindex = nla_get_u32(info->attrs[WIMAX_GNL_RESET_IFIDX]); wimax_dev = wimax_dev_get_by_genl_info(info, ifindex); if (wimax_dev == NULL) goto error_no_wimax_dev; /* Execute the operation and send the result back to user space */ result = wimax_reset(wimax_dev); dev_put(wimax_dev->net_dev); error_no_wimax_dev: d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result); return result; }