b61a5eea59
This simplifies the code since there's no longer a need to have error handling in the registration. Unfortunately it means more extern function declarations are needed, but the overall goal would seem to justify this. Due to the removal of duplication in the netlink policies, this reduces the size of wimax by almost 1k. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/*
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* Linux WiMAX
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* Implement and export a method for resetting a WiMAX device
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*
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*
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* Copyright (C) 2008 Intel Corporation <linux-wimax@intel.com>
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* This implements a simple synchronous call to reset a WiMAX device.
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*
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* Resets aim at being warm, keeping the device handles active;
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* however, when that fails, it falls back to a cold reset (that will
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* disconnect and reconnect the device).
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*/
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#include <net/wimax.h>
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#include <net/genetlink.h>
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#include <linux/wimax.h>
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#include <linux/security.h>
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#include <linux/export.h>
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#include "wimax-internal.h"
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#define D_SUBMODULE op_reset
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#include "debug-levels.h"
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/**
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* wimax_reset - Reset a WiMAX device
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*
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* @wimax_dev: WiMAX device descriptor
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*
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* Returns:
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*
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* %0 if ok and a warm reset was done (the device still exists in
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* the system).
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*
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* -%ENODEV if a cold/bus reset had to be done (device has
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* disconnected and reconnected, so current handle is not valid
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* any more).
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*
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* -%EINVAL if the device is not even registered.
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*
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* Any other negative error code shall be considered as
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* non-recoverable.
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*
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* Description:
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*
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* Called when wanting to reset the device for any reason. Device is
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* taken back to power on status.
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*
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* This call blocks; on successful return, the device has completed the
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* reset process and is ready to operate.
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*/
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int wimax_reset(struct wimax_dev *wimax_dev)
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{
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int result = -EINVAL;
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struct device *dev = wimax_dev_to_dev(wimax_dev);
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enum wimax_st state;
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might_sleep();
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d_fnstart(3, dev, "(wimax_dev %p)\n", wimax_dev);
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mutex_lock(&wimax_dev->mutex);
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dev_hold(wimax_dev->net_dev);
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state = wimax_dev->state;
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mutex_unlock(&wimax_dev->mutex);
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if (state >= WIMAX_ST_DOWN) {
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mutex_lock(&wimax_dev->mutex_reset);
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result = wimax_dev->op_reset(wimax_dev);
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mutex_unlock(&wimax_dev->mutex_reset);
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}
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dev_put(wimax_dev->net_dev);
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d_fnend(3, dev, "(wimax_dev %p) = %d\n", wimax_dev, result);
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return result;
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}
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EXPORT_SYMBOL(wimax_reset);
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/*
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* Exporting to user space over generic netlink
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*
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* Parse the reset command from user space, return error code.
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*
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* No attributes.
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*/
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int wimax_gnl_doit_reset(struct sk_buff *skb, struct genl_info *info)
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{
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int result, ifindex;
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struct wimax_dev *wimax_dev;
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d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info);
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result = -ENODEV;
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if (info->attrs[WIMAX_GNL_RESET_IFIDX] == NULL) {
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printk(KERN_ERR "WIMAX_GNL_OP_RFKILL: can't find IFIDX "
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"attribute\n");
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goto error_no_wimax_dev;
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}
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ifindex = nla_get_u32(info->attrs[WIMAX_GNL_RESET_IFIDX]);
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wimax_dev = wimax_dev_get_by_genl_info(info, ifindex);
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if (wimax_dev == NULL)
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goto error_no_wimax_dev;
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/* Execute the operation and send the result back to user space */
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result = wimax_reset(wimax_dev);
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dev_put(wimax_dev->net_dev);
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error_no_wimax_dev:
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d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
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return result;
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}
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