[mirror_ubuntu-eoan-kernel.git] / drivers / uwb / ie.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Ultra Wide Band
 * Information Element Handling
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 * Reinette Chatre <reinette.chatre@intel.com>
 *
 * FIXME: docs
 */

#include <linux/slab.h>
#include <linux/export.h>
#include "uwb-internal.h"

/**
 * uwb_ie_next - get the next IE in a buffer
 * @ptr: start of the buffer containing the IE data
 * @len: length of the buffer
 *
 * Both @ptr and @len are updated so subsequent calls to uwb_ie_next()
 * will get the next IE.
 *
 * NULL is returned (and @ptr and @len will not be updated) if there
 * are no more IEs in the buffer or the buffer is too short.
 */
struct uwb_ie_hdr *uwb_ie_next(void **ptr, size_t *len)
{
	struct uwb_ie_hdr *hdr;
	size_t ie_len;

	if (*len < sizeof(struct uwb_ie_hdr))
		return NULL;

	hdr = *ptr;
	ie_len = sizeof(struct uwb_ie_hdr) + hdr->length;

	if (*len < ie_len)
		return NULL;

	*ptr += ie_len;
	*len -= ie_len;

	return hdr;
}
EXPORT_SYMBOL_GPL(uwb_ie_next);

/**
 * uwb_ie_dump_hex - print IEs to a character buffer
 * @ies: the IEs to print.
 * @len: length of all the IEs.
 * @buf: the destination buffer.
 * @size: size of @buf.
 *
 * Returns the number of characters written.
 */
int uwb_ie_dump_hex(const struct uwb_ie_hdr *ies, size_t len,
		    char *buf, size_t size)
{
	void *ptr;
	const struct uwb_ie_hdr *ie;
	int r = 0;
	u8 *d;

	ptr = (void *)ies;
	for (;;) {
		ie = uwb_ie_next(&ptr, &len);
		if (!ie)
			break;

		r += scnprintf(buf + r, size - r, "%02x %02x",
			       (unsigned)ie->element_id,
			       (unsigned)ie->length);
		d = (uint8_t *)ie + sizeof(struct uwb_ie_hdr);
		while (d != ptr && r < size)
			r += scnprintf(buf + r, size - r, " %02x", (unsigned)*d++);
		if (r < size)
			buf[r++] = '\n';
	};

	return r;
}

/**
 * Get the IEs that a radio controller is sending in its beacon
 *
 * @uwb_rc:  UWB Radio Controller
 * @returns: Size read from the system
 *
 * We don't need to lock the uwb_rc's mutex because we don't modify
 * anything. Once done with the iedata buffer, call
 * uwb_rc_ie_release(iedata). Don't call kfree on it.
 */
static
ssize_t uwb_rc_get_ie(struct uwb_rc *uwb_rc, struct uwb_rc_evt_get_ie **pget_ie)
{
	ssize_t result;
	struct device *dev = &uwb_rc->uwb_dev.dev;
	struct uwb_rccb *cmd = NULL;
	struct uwb_rceb *reply = NULL;
	struct uwb_rc_evt_get_ie *get_ie;

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (cmd == NULL)
		return -ENOMEM;

	cmd->bCommandType = UWB_RC_CET_GENERAL;
	cmd->wCommand = cpu_to_le16(UWB_RC_CMD_GET_IE);
	result = uwb_rc_vcmd(uwb_rc, "GET_IE", cmd, sizeof(*cmd),
			     UWB_RC_CET_GENERAL, UWB_RC_CMD_GET_IE,
			     &reply);
	kfree(cmd);
	if (result < 0)
		return result;

	get_ie = container_of(reply, struct uwb_rc_evt_get_ie, rceb);
	if (result < sizeof(*get_ie)) {
		dev_err(dev, "not enough data returned for decoding GET IE "
			"(%zu bytes received vs %zu needed)\n",
			result, sizeof(*get_ie));
		return -EINVAL;
	} else if (result < sizeof(*get_ie) + le16_to_cpu(get_ie->wIELength)) {
		dev_err(dev, "not enough data returned for decoding GET IE "
			"payload (%zu bytes received vs %zu needed)\n", result,
			sizeof(*get_ie) + le16_to_cpu(get_ie->wIELength));
		return -EINVAL;
	}

	*pget_ie = get_ie;
	return result;
}


/**
 * Replace all IEs currently being transmitted by a device
 *
 * @cmd:    pointer to the SET-IE command with the IEs to set
 * @size:   size of @buf
 */
int uwb_rc_set_ie(struct uwb_rc *rc, struct uwb_rc_cmd_set_ie *cmd)
{
	int result;
	struct device *dev = &rc->uwb_dev.dev;
	struct uwb_rc_evt_set_ie reply;

	reply.rceb.bEventType = UWB_RC_CET_GENERAL;
	reply.rceb.wEvent = UWB_RC_CMD_SET_IE;
	result = uwb_rc_cmd(rc, "SET-IE", &cmd->rccb,
			    sizeof(*cmd) + le16_to_cpu(cmd->wIELength),
			    &reply.rceb, sizeof(reply));
	if (result < 0)
		goto error_cmd;
	else if (result != sizeof(reply)) {
		dev_err(dev, "SET-IE: not enough data to decode reply "
			"(%d bytes received vs %zu needed)\n",
			result, sizeof(reply));
		result = -EIO;
	} else if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
		dev_err(dev, "SET-IE: command execution failed: %s (%d)\n",
			uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
		result = -EIO;
	} else
		result = 0;
error_cmd:
	return result;
}

/* Cleanup the whole IE management subsystem */
void uwb_rc_ie_init(struct uwb_rc *uwb_rc)
{
	mutex_init(&uwb_rc->ies_mutex);
}


/**
 * uwb_rc_ie_setup - setup a radio controller's IE manager
 * @uwb_rc: the radio controller.
 *
 * The current set of IEs are obtained from the hardware with a GET-IE
 * command (since the radio controller is not yet beaconing this will
 * be just the hardware's MAC and PHY Capability IEs).
 *
 * Returns 0 on success; -ve on an error.
 */
int uwb_rc_ie_setup(struct uwb_rc *uwb_rc)
{
	struct uwb_rc_evt_get_ie *ie_info = NULL;
	int capacity;

	capacity = uwb_rc_get_ie(uwb_rc, &ie_info);
	if (capacity < 0)
		return capacity;

	mutex_lock(&uwb_rc->ies_mutex);

	uwb_rc->ies = (struct uwb_rc_cmd_set_ie *)ie_info;
	uwb_rc->ies->rccb.bCommandType = UWB_RC_CET_GENERAL;
	uwb_rc->ies->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SET_IE);
	uwb_rc->ies_capacity = capacity;

	mutex_unlock(&uwb_rc->ies_mutex);

	return 0;
}


/* Cleanup the whole IE management subsystem */
void uwb_rc_ie_release(struct uwb_rc *uwb_rc)
{
	kfree(uwb_rc->ies);
	uwb_rc->ies = NULL;
	uwb_rc->ies_capacity = 0;
}


static int uwb_rc_ie_add_one(struct uwb_rc *rc, const struct uwb_ie_hdr *new_ie)
{
	struct uwb_rc_cmd_set_ie *new_ies;
	void *ptr, *prev_ie;
	struct uwb_ie_hdr *ie;
	size_t length, new_ie_len, new_capacity, size, prev_size;

	length = le16_to_cpu(rc->ies->wIELength);
	new_ie_len = sizeof(struct uwb_ie_hdr) + new_ie->length;
	new_capacity = sizeof(struct uwb_rc_cmd_set_ie) + length + new_ie_len;

	if (new_capacity > rc->ies_capacity) {
		new_ies = krealloc(rc->ies, new_capacity, GFP_KERNEL);
		if (!new_ies)
			return -ENOMEM;
		rc->ies = new_ies;
	}

	ptr = rc->ies->IEData;
	size = length;
	for (;;) {
		prev_ie = ptr;
		prev_size = size;
		ie = uwb_ie_next(&ptr, &size);
		if (!ie || ie->element_id > new_ie->element_id)
			break;
	}

	memmove(prev_ie + new_ie_len, prev_ie, prev_size);
	memcpy(prev_ie, new_ie, new_ie_len);
	rc->ies->wIELength = cpu_to_le16(length + new_ie_len);

	return 0;
}

/**
 * uwb_rc_ie_add - add new IEs to the radio controller's beacon
 * @uwb_rc: the radio controller.
 * @ies: the buffer containing the new IE or IEs to be added to
 *       the device's beacon.
 * @size: length of all the IEs.
 *
 * According to WHCI 0.95 [4.13.6] the driver will only receive the RCEB
 * after the device sent the first beacon that includes the IEs specified
 * in the SET IE command. We thus cannot send this command if the device is
 * not beaconing. Instead, a SET IE command will be sent later right after
 * we start beaconing.
 *
 * Setting an IE on the device will overwrite all current IEs in device. So
 * we take the current IEs being transmitted by the device, insert the
 * new one, and call SET IE with all the IEs needed.
 *
 * Returns 0 on success; or -ENOMEM.
 */
int uwb_rc_ie_add(struct uwb_rc *uwb_rc,
		  const struct uwb_ie_hdr *ies, size_t size)
{
	int result = 0;
	void *ptr;
	const struct uwb_ie_hdr *ie;

	mutex_lock(&uwb_rc->ies_mutex);

	ptr = (void *)ies;
	for (;;) {
		ie = uwb_ie_next(&ptr, &size);
		if (!ie)
			break;

		result = uwb_rc_ie_add_one(uwb_rc, ie);
		if (result < 0)
			break;
	}
	if (result >= 0) {
		if (size == 0) {
			if (uwb_rc->beaconing != -1)
				result = uwb_rc_set_ie(uwb_rc, uwb_rc->ies);
		} else
			result = -EINVAL;
	}

	mutex_unlock(&uwb_rc->ies_mutex);

	return result;
}
EXPORT_SYMBOL_GPL(uwb_rc_ie_add);


/*
 * Remove an IE from internal cache
 *
 * We are dealing with our internal IE cache so no need to verify that the
 * IEs are valid (it has been done already).
 *
 * Should be called with ies_mutex held
 *
 * We do not break out once an IE is found in the cache. It is currently
 * possible to have more than one IE with the same ID included in the
 * beacon. We don't reallocate, we just mark the size smaller.
 */
static
void uwb_rc_ie_cache_rm(struct uwb_rc *uwb_rc, enum uwb_ie to_remove)
{
	struct uwb_ie_hdr *ie;
	size_t len = le16_to_cpu(uwb_rc->ies->wIELength);
	void *ptr;
	size_t size;

	ptr = uwb_rc->ies->IEData;
	size = len;
	for (;;) {
		ie = uwb_ie_next(&ptr, &size);
		if (!ie)
			break;
		if (ie->element_id == to_remove) {
			len -= sizeof(struct uwb_ie_hdr) + ie->length;
			memmove(ie, ptr, size);
			ptr = ie;
		}
	}
	uwb_rc->ies->wIELength = cpu_to_le16(len);
}


/**
 * uwb_rc_ie_rm - remove an IE from the radio controller's beacon
 * @uwb_rc: the radio controller.
 * @element_id: the element ID of the IE to remove.
 *
 * Only IEs previously added with uwb_rc_ie_add() may be removed.
 *
 * Returns 0 on success; or -ve the SET-IE command to the radio
 * controller failed.
 */
int uwb_rc_ie_rm(struct uwb_rc *uwb_rc, enum uwb_ie element_id)
{
	int result = 0;

	mutex_lock(&uwb_rc->ies_mutex);

	uwb_rc_ie_cache_rm(uwb_rc, element_id);

	if (uwb_rc->beaconing != -1)
		result = uwb_rc_set_ie(uwb_rc, uwb_rc->ies);

	mutex_unlock(&uwb_rc->ies_mutex);

	return result;
}
EXPORT_SYMBOL_GPL(uwb_rc_ie_rm);
Commit	Line	Data
04672fe6	1	// SPDX-License-Identifier: GPL-2.0-only
22d203ec IPG	2	/*
	3	* Ultra Wide Band
	4	* Information Element Handling
	5	*
	6	* Copyright (C) 2005-2006 Intel Corporation
	7	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	8	* Reinette Chatre <reinette.chatre@intel.com>
	9	*
22d203ec IPG	10	* FIXME: docs
	11	*/
	12
5a0e3ad6	13	#include <linux/slab.h>
475c0a6b	14	#include <linux/export.h>
22d203ec	15	#include "uwb-internal.h"
22d203ec IPG	16
	17	/**
	18	* uwb_ie_next - get the next IE in a buffer
	19	* @ptr: start of the buffer containing the IE data
	20	* @len: length of the buffer
	21	*
	22	* Both @ptr and @len are updated so subsequent calls to uwb_ie_next()
	23	* will get the next IE.
	24	*
	25	* NULL is returned (and @ptr and @len will not be updated) if there
	26	* are no more IEs in the buffer or the buffer is too short.
	27	*/
	28	struct uwb_ie_hdr uwb_ie_next(void ptr, size_t len)
	29	{
	30	struct uwb_ie_hdr *hdr;
	31	size_t ie_len;
	32
	33	if (*len < sizeof(struct uwb_ie_hdr))
	34	return NULL;
	35
	36	hdr = *ptr;
	37	ie_len = sizeof(struct uwb_ie_hdr) + hdr->length;
	38
	39	if (*len < ie_len)
	40	return NULL;
	41
	42	*ptr += ie_len;
	43	*len -= ie_len;
	44
	45	return hdr;
	46	}
	47	EXPORT_SYMBOL_GPL(uwb_ie_next);
	48
1cde7f68 DV	49	/**
	50	* uwb_ie_dump_hex - print IEs to a character buffer
	51	* @ies: the IEs to print.
	52	* @len: length of all the IEs.
	53	* @buf: the destination buffer.
	54	* @size: size of @buf.
	55	*
	56	* Returns the number of characters written.
	57	*/
	58	int uwb_ie_dump_hex(const struct uwb_ie_hdr *ies, size_t len,
	59	char *buf, size_t size)
	60	{
	61	void *ptr;
	62	const struct uwb_ie_hdr *ie;
	63	int r = 0;
	64	u8 *d;
	65
	66	ptr = (void *)ies;
	67	for (;;) {
	68	ie = uwb_ie_next(&ptr, &len);
	69	if (!ie)
	70	break;
	71
	72	r += scnprintf(buf + r, size - r, "%02x %02x",
	73	(unsigned)ie->element_id,
	74	(unsigned)ie->length);
	75	d = (uint8_t *)ie + sizeof(struct uwb_ie_hdr);
	76	while (d != ptr && r < size)
	77	r += scnprintf(buf + r, size - r, " %02x", (unsigned)*d++);
	78	if (r < size)
	79	buf[r++] = '\n';
	80	};
	81
	82	return r;
	83	}
	84
22d203ec IPG	85	/**
	86	* Get the IEs that a radio controller is sending in its beacon
	87	*
	88	* @uwb_rc: UWB Radio Controller
	89	* @returns: Size read from the system
	90	*
	91	* We don't need to lock the uwb_rc's mutex because we don't modify
	92	* anything. Once done with the iedata buffer, call
	93	* uwb_rc_ie_release(iedata). Don't call kfree on it.
	94	*/
1cde7f68	95	static
22d203ec IPG	96	ssize_t uwb_rc_get_ie(struct uwb_rc uwb_rc, struct uwb_rc_evt_get_ie *pget_ie)
	97	{
	98	ssize_t result;
	99	struct device *dev = &uwb_rc->uwb_dev.dev;
	100	struct uwb_rccb *cmd = NULL;
	101	struct uwb_rceb *reply = NULL;
	102	struct uwb_rc_evt_get_ie *get_ie;
	103
22d203ec IPG	104	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
22d203ec IPG	105	if (cmd == NULL)
1cde7f68 DV	106	return -ENOMEM;
1cde7f68 DV	107
22d203ec IPG	108	cmd->bCommandType = UWB_RC_CET_GENERAL;
	109	cmd->wCommand = cpu_to_le16(UWB_RC_CMD_GET_IE);
	110	result = uwb_rc_vcmd(uwb_rc, "GET_IE", cmd, sizeof(*cmd),
	111	UWB_RC_CET_GENERAL, UWB_RC_CMD_GET_IE,
	112	&reply);
1cde7f68	113	kfree(cmd);
22d203ec	114	if (result < 0)
1cde7f68 DV	115	return result;
1cde7f68 DV	116
22d203ec IPG	117	get_ie = container_of(reply, struct uwb_rc_evt_get_ie, rceb);
	118	if (result < sizeof(*get_ie)) {
	119	dev_err(dev, "not enough data returned for decoding GET IE "
	120	"(%zu bytes received vs %zu needed)\n",
	121	result, sizeof(*get_ie));
1cde7f68	122	return -EINVAL;
22d203ec IPG	123	} else if (result < sizeof(*get_ie) + le16_to_cpu(get_ie->wIELength)) {
	124	dev_err(dev, "not enough data returned for decoding GET IE "
	125	"payload (%zu bytes received vs %zu needed)\n", result,
	126	sizeof(*get_ie) + le16_to_cpu(get_ie->wIELength));
22d203ec IPG	127	return -EINVAL;
22d203ec IPG	128	}
22d203ec	129
1cde7f68	130	*pget_ie = get_ie;
22d203ec IPG	131	return result;
22d203ec IPG	132	}
22d203ec IPG	133
	134
	135	/**
	136	* Replace all IEs currently being transmitted by a device
	137	*
	138	* @cmd: pointer to the SET-IE command with the IEs to set
	139	* @size: size of @buf
	140	*/
	141	int uwb_rc_set_ie(struct uwb_rc rc, struct uwb_rc_cmd_set_ie cmd)
	142	{
	143	int result;
	144	struct device *dev = &rc->uwb_dev.dev;
	145	struct uwb_rc_evt_set_ie reply;
	146
	147	reply.rceb.bEventType = UWB_RC_CET_GENERAL;
	148	reply.rceb.wEvent = UWB_RC_CMD_SET_IE;
	149	result = uwb_rc_cmd(rc, "SET-IE", &cmd->rccb,
	150	sizeof(*cmd) + le16_to_cpu(cmd->wIELength),
	151	&reply.rceb, sizeof(reply));
	152	if (result < 0)
	153	goto error_cmd;
	154	else if (result != sizeof(reply)) {
	155	dev_err(dev, "SET-IE: not enough data to decode reply "
	156	"(%d bytes received vs %zu needed)\n",
	157	result, sizeof(reply));
	158	result = -EIO;
	159	} else if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
	160	dev_err(dev, "SET-IE: command execution failed: %s (%d)\n",
	161	uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
	162	result = -EIO;
	163	} else
	164	result = 0;
	165	error_cmd:
	166	return result;
	167	}
	168
22d203ec IPG	169	/* Cleanup the whole IE management subsystem */
	170	void uwb_rc_ie_init(struct uwb_rc *uwb_rc)
	171	{
	172	mutex_init(&uwb_rc->ies_mutex);
	173	}
	174
	175
	176	/**
1cde7f68 DV	177	* uwb_rc_ie_setup - setup a radio controller's IE manager
1cde7f68 DV	178	* @uwb_rc: the radio controller.
22d203ec	179	*
1cde7f68 DV	180	* The current set of IEs are obtained from the hardware with a GET-IE
	181	* command (since the radio controller is not yet beaconing this will
	182	* be just the hardware's MAC and PHY Capability IEs).
22d203ec	183	*
1cde7f68	184	* Returns 0 on success; -ve on an error.
22d203ec	185	*/
1cde7f68	186	int uwb_rc_ie_setup(struct uwb_rc *uwb_rc)
22d203ec	187	{
1cde7f68 DV	188	struct uwb_rc_evt_get_ie *ie_info = NULL;
	189	int capacity;
	190
	191	capacity = uwb_rc_get_ie(uwb_rc, &ie_info);
	192	if (capacity < 0)
	193	return capacity;
22d203ec	194
22d203ec	195	mutex_lock(&uwb_rc->ies_mutex);
1cde7f68 DV	196
1cde7f68 DV	197	uwb_rc->ies = (struct uwb_rc_cmd_set_ie *)ie_info;
22d203ec IPG	198	uwb_rc->ies->rccb.bCommandType = UWB_RC_CET_GENERAL;
	199	uwb_rc->ies->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SET_IE);
	200	uwb_rc->ies_capacity = capacity;
1cde7f68	201
22d203ec	202	mutex_unlock(&uwb_rc->ies_mutex);
1cde7f68 DV	203
1cde7f68 DV	204	return 0;
22d203ec IPG	205	}
	206
	207
	208	/* Cleanup the whole IE management subsystem */
	209	void uwb_rc_ie_release(struct uwb_rc *uwb_rc)
	210	{
	211	kfree(uwb_rc->ies);
	212	uwb_rc->ies = NULL;
	213	uwb_rc->ies_capacity = 0;
	214	}
	215
	216
1cde7f68	217	static int uwb_rc_ie_add_one(struct uwb_rc rc, const struct uwb_ie_hdr new_ie)
22d203ec	218	{
1cde7f68 DV	219	struct uwb_rc_cmd_set_ie *new_ies;
	220	void ptr, prev_ie;
	221	struct uwb_ie_hdr *ie;
	222	size_t length, new_ie_len, new_capacity, size, prev_size;
	223
	224	length = le16_to_cpu(rc->ies->wIELength);
	225	new_ie_len = sizeof(struct uwb_ie_hdr) + new_ie->length;
	226	new_capacity = sizeof(struct uwb_rc_cmd_set_ie) + length + new_ie_len;
	227
	228	if (new_capacity > rc->ies_capacity) {
	229	new_ies = krealloc(rc->ies, new_capacity, GFP_KERNEL);
	230	if (!new_ies)
	231	return -ENOMEM;
	232	rc->ies = new_ies;
	233	}
	234
	235	ptr = rc->ies->IEData;
	236	size = length;
	237	for (;;) {
	238	prev_ie = ptr;
	239	prev_size = size;
	240	ie = uwb_ie_next(&ptr, &size);
	241	if (!ie \|\| ie->element_id > new_ie->element_id)
	242	break;
	243	}
	244
	245	memmove(prev_ie + new_ie_len, prev_ie, prev_size);
	246	memcpy(prev_ie, new_ie, new_ie_len);
	247	rc->ies->wIELength = cpu_to_le16(length + new_ie_len);
	248
22d203ec IPG	249	return 0;
	250	}
	251
22d203ec	252	/**
1cde7f68 DV	253	* uwb_rc_ie_add - add new IEs to the radio controller's beacon
1cde7f68 DV	254	* @uwb_rc: the radio controller.
22d203ec	255	* @ies: the buffer containing the new IE or IEs to be added to
1cde7f68 DV	256	* the device's beacon.
1cde7f68 DV	257	* @size: length of all the IEs.
22d203ec IPG	258	*
	259	* According to WHCI 0.95 [4.13.6] the driver will only receive the RCEB
	260	* after the device sent the first beacon that includes the IEs specified
	261	* in the SET IE command. We thus cannot send this command if the device is
	262	* not beaconing. Instead, a SET IE command will be sent later right after
	263	* we start beaconing.
	264	*
	265	* Setting an IE on the device will overwrite all current IEs in device. So
1cde7f68	266	* we take the current IEs being transmitted by the device, insert the
22d203ec IPG	267	* new one, and call SET IE with all the IEs needed.
22d203ec IPG	268	*
1cde7f68	269	* Returns 0 on success; or -ENOMEM.
22d203ec IPG	270	*/
	271	int uwb_rc_ie_add(struct uwb_rc *uwb_rc,
	272	const struct uwb_ie_hdr *ies, size_t size)
	273	{
	274	int result = 0;
1cde7f68 DV	275	void *ptr;
	276	const struct uwb_ie_hdr *ie;
	277
22d203ec	278	mutex_lock(&uwb_rc->ies_mutex);
1cde7f68 DV	279
	280	ptr = (void *)ies;
	281	for (;;) {
	282	ie = uwb_ie_next(&ptr, &size);
	283	if (!ie)
	284	break;
	285
	286	result = uwb_rc_ie_add_one(uwb_rc, ie);
	287	if (result < 0)
	288	break;
22d203ec	289	}
1cde7f68 DV	290	if (result >= 0) {
	291	if (size == 0) {
	292	if (uwb_rc->beaconing != -1)
	293	result = uwb_rc_set_ie(uwb_rc, uwb_rc->ies);
22d203ec	294	} else
1cde7f68	295	result = -EINVAL;
22d203ec	296	}
1cde7f68	297
22d203ec	298	mutex_unlock(&uwb_rc->ies_mutex);
1cde7f68	299
22d203ec IPG	300	return result;
	301	}
	302	EXPORT_SYMBOL_GPL(uwb_rc_ie_add);
	303
	304
	305	/*
	306	* Remove an IE from internal cache
	307	*
	308	* We are dealing with our internal IE cache so no need to verify that the
	309	* IEs are valid (it has been done already).
	310	*
	311	* Should be called with ies_mutex held
	312	*
	313	* We do not break out once an IE is found in the cache. It is currently
	314	* possible to have more than one IE with the same ID included in the
	315	* beacon. We don't reallocate, we just mark the size smaller.
	316	*/
	317	static
1cde7f68	318	void uwb_rc_ie_cache_rm(struct uwb_rc *uwb_rc, enum uwb_ie to_remove)
22d203ec	319	{
1cde7f68 DV	320	struct uwb_ie_hdr *ie;
	321	size_t len = le16_to_cpu(uwb_rc->ies->wIELength);
	322	void *ptr;
	323	size_t size;
	324
	325	ptr = uwb_rc->ies->IEData;
	326	size = len;
	327	for (;;) {
	328	ie = uwb_ie_next(&ptr, &size);
	329	if (!ie)
	330	break;
	331	if (ie->element_id == to_remove) {
	332	len -= sizeof(struct uwb_ie_hdr) + ie->length;
	333	memmove(ie, ptr, size);
	334	ptr = ie;
22d203ec IPG	335	}
22d203ec IPG	336	}
1cde7f68	337	uwb_rc->ies->wIELength = cpu_to_le16(len);
22d203ec IPG	338	}
	339
	340
	341	/**
1cde7f68 DV	342	* uwb_rc_ie_rm - remove an IE from the radio controller's beacon
	343	* @uwb_rc: the radio controller.
	344	* @element_id: the element ID of the IE to remove.
22d203ec	345	*
1cde7f68 DV	346	* Only IEs previously added with uwb_rc_ie_add() may be removed.
	347	*
	348	* Returns 0 on success; or -ve the SET-IE command to the radio
	349	* controller failed.
22d203ec IPG	350	*/
	351	int uwb_rc_ie_rm(struct uwb_rc *uwb_rc, enum uwb_ie element_id)
	352	{
1cde7f68	353	int result = 0;
22d203ec	354
22d203ec	355	mutex_lock(&uwb_rc->ies_mutex);
1cde7f68 DV	356
	357	uwb_rc_ie_cache_rm(uwb_rc, element_id);
	358
	359	if (uwb_rc->beaconing != -1)
22d203ec	360	result = uwb_rc_set_ie(uwb_rc, uwb_rc->ies);
1cde7f68	361
22d203ec	362	mutex_unlock(&uwb_rc->ies_mutex);
1cde7f68	363
22d203ec IPG	364	return result;
	365	}
	366	EXPORT_SYMBOL_GPL(uwb_rc_ie_rm);