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108 lines
2.9 KiB
108 lines
2.9 KiB
// 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 <[email protected]> |
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* Inaky Perez-Gonzalez <[email protected]> |
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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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