^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Linux WiMAX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Implement and export a method for resetting a WiMAX device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2008 Intel Corporation <linux-wimax@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * This implements a simple synchronous call to reset a WiMAX device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Resets aim at being warm, keeping the device handles active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * however, when that fails, it falls back to a cold reset (that will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * disconnect and reconnect the device).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <net/wimax.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <net/genetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/wimax.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "wimax-internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define D_SUBMODULE op_reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include "debug-levels.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * wimax_reset - Reset a WiMAX device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * @wimax_dev: WiMAX device descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * Returns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * %0 if ok and a warm reset was done (the device still exists in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * the system).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * -%ENODEV if a cold/bus reset had to be done (device has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * disconnected and reconnected, so current handle is not valid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * any more).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * -%EINVAL if the device is not even registered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * Any other negative error code shall be considered as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * non-recoverable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * Called when wanting to reset the device for any reason. Device is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * taken back to power on status.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * This call blocks; on successful return, the device has completed the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * reset process and is ready to operate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int wimax_reset(struct wimax_dev *wimax_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) int result = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct device *dev = wimax_dev_to_dev(wimax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) enum wimax_st state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) might_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) d_fnstart(3, dev, "(wimax_dev %p)\n", wimax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) mutex_lock(&wimax_dev->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) dev_hold(wimax_dev->net_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) state = wimax_dev->state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) mutex_unlock(&wimax_dev->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (state >= WIMAX_ST_DOWN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) mutex_lock(&wimax_dev->mutex_reset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) result = wimax_dev->op_reset(wimax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) mutex_unlock(&wimax_dev->mutex_reset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) dev_put(wimax_dev->net_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) d_fnend(3, dev, "(wimax_dev %p) = %d\n", wimax_dev, result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) EXPORT_SYMBOL(wimax_reset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * Exporting to user space over generic netlink
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * Parse the reset command from user space, return error code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * No attributes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int wimax_gnl_doit_reset(struct sk_buff *skb, struct genl_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) int result, ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct wimax_dev *wimax_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) result = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (info->attrs[WIMAX_GNL_RESET_IFIDX] == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pr_err("WIMAX_GNL_OP_RFKILL: can't find IFIDX attribute\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) goto error_no_wimax_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ifindex = nla_get_u32(info->attrs[WIMAX_GNL_RESET_IFIDX]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) wimax_dev = wimax_dev_get_by_genl_info(info, ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (wimax_dev == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) goto error_no_wimax_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* Execute the operation and send the result back to user space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) result = wimax_reset(wimax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) dev_put(wimax_dev->net_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) error_no_wimax_dev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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