// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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* 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 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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pr_err("WIMAX_GNL_OP_RFKILL: can't find IFIDX 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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