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msm: camera: core: validation of session/device/link handle

Browse source 
This change is to validate session, device and link handle.
Also, checks whether the device handle belongs to
correct session handle or not.

CRs-Fixed: 3496553
Change-Id: I6b86bf7d0908a280e90e085a3b3e1727facdf8c6
Signed-off-by: Karthik Dillibabu <quic_kard@quicinc.com>
This commit is contained in:
Karthik Dillibabu 2023-05-09 15:55:25 +05:30
commit 217ebc5e61
3 changed files with 177 additions and 63 deletions
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70
drivers/cam_req_mgr/cam_req_mgr_core.c
View file

@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.
* Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
* Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <linux/module.h>
@ -3164,9 +3164,7 @@ static int cam_req_mgr_cb_add_req(struct cam_req_mgr_add_request *add_req)
return -EINVAL;
}
link = (struct cam_req_mgr_core_link *)
cam_get_device_priv(add_req->link_hdl);
link = cam_get_link_priv(add_req->link_hdl);
if (!link) {
CAM_DBG(CAM_CRM, "link ptr NULL %x", add_req->link_hdl);
return -EINVAL;
@ -3253,8 +3251,7 @@ static int cam_req_mgr_cb_notify_err(
goto end;
}
link = (struct cam_req_mgr_core_link *)
cam_get_device_priv(err_info->link_hdl);
link = cam_get_link_priv(err_info->link_hdl);
if (!link) {
CAM_DBG(CAM_CRM, "link ptr NULL %x", err_info->link_hdl);
rc = -EINVAL;
@ -3351,8 +3348,7 @@ static int cam_req_mgr_cb_notify_timer(
goto end;
}
link = (struct cam_req_mgr_core_link *)
cam_get_device_priv(timer_data->link_hdl);
link = cam_get_link_priv(timer_data->link_hdl);
if (!link) {
CAM_DBG(CAM_CRM, "link ptr NULL %x", timer_data->link_hdl);
rc = -EINVAL;
@ -3406,8 +3402,7 @@ static int cam_req_mgr_cb_notify_stop(
goto end;
}
link = (struct cam_req_mgr_core_link *)
cam_get_device_priv(stop_info->link_hdl);
link = cam_get_link_priv(stop_info->link_hdl);
if (!link) {
CAM_DBG(CAM_CRM, "link ptr NULL %x", stop_info->link_hdl);
rc = -EINVAL;
@ -3470,8 +3465,7 @@ static int cam_req_mgr_cb_notify_trigger(
goto end;
}
link = (struct cam_req_mgr_core_link *)
cam_get_device_priv(trigger_data->link_hdl);
link = cam_get_link_priv(trigger_data->link_hdl);
if (!link) {
CAM_DBG(CAM_CRM, "link ptr NULL %x", trigger_data->link_hdl);
rc = -EINVAL;
@ -3851,7 +3845,7 @@ static int __cam_req_mgr_unlink(
__cam_req_mgr_destroy_subdev(&link->l_dev);
/* Destroy the link handle */
rc = cam_destroy_device_hdl(link->link_hdl);
rc = cam_destroy_link_hdl(link->link_hdl);
if (rc < 0) {
CAM_ERR(CAM_CRM, "error destroying link hdl %x rc %d",
link->link_hdl, rc);
@ -3877,8 +3871,7 @@ int cam_req_mgr_destroy_session(
}
mutex_lock(&g_crm_core_dev->crm_lock);
cam_session = (struct cam_req_mgr_core_session *)
cam_get_device_priv(ses_info->session_hdl);
cam_session = cam_get_session_priv(ses_info->session_hdl);
if (!cam_session || (cam_session->session_hdl != ses_info->session_hdl)) {
CAM_ERR(CAM_CRM, "session: %s, ses_info->ses_hdl:%x, session->ses_hdl:%x",
CAM_IS_NULL_TO_STR(cam_session), ses_info->session_hdl,
@ -3950,8 +3943,7 @@ int cam_req_mgr_link(struct cam_req_mgr_ver_info *link_info)
mutex_lock(&g_crm_core_dev->crm_lock);
/* session hdl's priv data is cam session struct */
cam_session = (struct cam_req_mgr_core_session *)
cam_get_device_priv(link_info->u.link_info_v1.session_hdl);
cam_session = cam_get_session_priv(link_info->u.link_info_v1.session_hdl);
if (!cam_session || (cam_session->session_hdl != link_info->u.link_info_v1.session_hdl)) {
CAM_ERR(CAM_CRM, "session: %s, link_info->ses_hdl:%x, session->ses_hdl:%x",
CAM_IS_NULL_TO_STR(cam_session), link_info->u.link_info_v1.session_hdl,
@ -3974,8 +3966,8 @@ int cam_req_mgr_link(struct cam_req_mgr_ver_info *link_info)
root_dev.priv = (void *)link;
root_dev.dev_id = CAM_CRM;
mutex_lock(&link->lock);
/* Create unique dev handle for link */
link->link_hdl = cam_create_device_hdl(&root_dev);
/* Create unique handle for link */
link->link_hdl = cam_create_link_hdl(&root_dev);
if (link->link_hdl < 0) {
CAM_ERR(CAM_CRM,
"Insufficient memory to create new device handle");
@ -4030,7 +4022,7 @@ int cam_req_mgr_link(struct cam_req_mgr_ver_info *link_info)
setup_failed:
__cam_req_mgr_destroy_subdev(&link->l_dev);
create_subdev_failed:
cam_destroy_device_hdl(link->link_hdl);
cam_destroy_link_hdl(link->link_hdl);
link_info->u.link_info_v1.link_hdl = -1;
link_hdl_fail:
mutex_unlock(&link->lock);
@ -4062,8 +4054,7 @@ int cam_req_mgr_link_v2(struct cam_req_mgr_ver_info *link_info)
mutex_lock(&g_crm_core_dev->crm_lock);
/* session hdl's priv data is cam session struct */
cam_session = (struct cam_req_mgr_core_session *)
cam_get_device_priv(link_info->u.link_info_v2.session_hdl);
cam_session = cam_get_session_priv(link_info->u.link_info_v2.session_hdl);
if (!cam_session || (cam_session->session_hdl != link_info->u.link_info_v2.session_hdl)) {
CAM_ERR(CAM_CRM, "session: %s, link_info->ses_hdl:%x, session->ses_hdl:%x",
CAM_IS_NULL_TO_STR(cam_session), link_info->u.link_info_v2.session_hdl,
@ -4087,8 +4078,8 @@ int cam_req_mgr_link_v2(struct cam_req_mgr_ver_info *link_info)
root_dev.dev_id = CAM_CRM;
mutex_lock(&link->lock);
/* Create unique dev handle for link */
link->link_hdl = cam_create_device_hdl(&root_dev);
/* Create unique handle for link */
link->link_hdl = cam_create_link_hdl(&root_dev);
if (link->link_hdl < 0) {
CAM_ERR(CAM_CRM,
"Insufficient memory to create new device handle");
@ -4148,7 +4139,7 @@ int cam_req_mgr_link_v2(struct cam_req_mgr_ver_info *link_info)
setup_failed:
__cam_req_mgr_destroy_subdev(&link->l_dev);
create_subdev_failed:
cam_destroy_device_hdl(link->link_hdl);
cam_destroy_link_hdl(link->link_hdl);
link_info->u.link_info_v2.link_hdl = -1;
link_hdl_fail:
mutex_unlock(&link->lock);
@ -4173,8 +4164,7 @@ int cam_req_mgr_unlink(struct cam_req_mgr_unlink_info *unlink_info)
CAM_DBG(CAM_CRM, "link_hdl %x", unlink_info->link_hdl);
/* session hdl's priv data is cam session struct */
cam_session = (struct cam_req_mgr_core_session *)
cam_get_device_priv(unlink_info->session_hdl);
cam_session = cam_get_session_priv(unlink_info->session_hdl);
if (!cam_session || (cam_session->session_hdl != unlink_info->session_hdl)) {
CAM_ERR(CAM_CRM, "session: %s, unlink_info->ses_hdl:%x, cam_session->ses_hdl:%x",
CAM_IS_NULL_TO_STR(cam_session), unlink_info->session_hdl,
@ -4184,7 +4174,7 @@ int cam_req_mgr_unlink(struct cam_req_mgr_unlink_info *unlink_info)
}
/* link hdl's priv data is core_link struct */
link = cam_get_device_priv(unlink_info->link_hdl);
link = cam_get_link_priv(unlink_info->link_hdl);
if (!link || (link->link_hdl != unlink_info->link_hdl)) {
CAM_ERR(CAM_CRM, "link: %s, unlink_info->link_hdl:%x, link->link_hdl:%x",
CAM_IS_NULL_TO_STR(link), unlink_info->link_hdl,
@ -4219,8 +4209,7 @@ int cam_req_mgr_schedule_request(
}
mutex_lock(&g_crm_core_dev->crm_lock);
link = (struct cam_req_mgr_core_link *)
cam_get_device_priv(sched_req->link_hdl);
link = cam_get_link_priv(sched_req->link_hdl);
if (!link || (link->link_hdl != sched_req->link_hdl)) {
CAM_ERR(CAM_CRM, "link: %s, sched_req->link_hdl:%x, link->link_hdl:%x",
CAM_IS_NULL_TO_STR(link), sched_req->link_hdl,
@ -4306,8 +4295,7 @@ int cam_req_mgr_sync_config(
mutex_lock(&g_crm_core_dev->crm_lock);
/* session hdl's priv data is cam session struct */
cam_session = (struct cam_req_mgr_core_session *)
cam_get_device_priv(sync_info->session_hdl);
cam_session = cam_get_session_priv(sync_info->session_hdl);
if (!cam_session || (cam_session->session_hdl != sync_info->session_hdl)) {
CAM_ERR(CAM_CRM, "session: %s, sync_info->session_hdl:%x, session->ses_hdl:%x",
CAM_IS_NULL_TO_STR(cam_session), sync_info->session_hdl,
@ -4326,7 +4314,7 @@ int cam_req_mgr_sync_config(
goto done;
}
link[i] = cam_get_device_priv(sync_info->link_hdls[i]);
link[i] = cam_get_link_priv(sync_info->link_hdls[i]);
if (!link[i] || (link[i]->link_hdl != sync_info->link_hdls[i])) {
CAM_ERR(CAM_CRM, "link: %s, sync_info->link_hdl:%x, link->link_hdl:%x",
CAM_IS_NULL_TO_STR(link), sync_info->link_hdls[i],
@ -4403,9 +4391,9 @@ int cam_req_mgr_flush_requests(
}
mutex_lock(&g_crm_core_dev->crm_lock);
/* session hdl's priv data is cam session struct */
session = (struct cam_req_mgr_core_session *)
cam_get_device_priv(flush_info->session_hdl);
session = cam_get_session_priv(flush_info->session_hdl);
if (!session || (session->session_hdl != flush_info->session_hdl)) {
CAM_ERR(CAM_CRM, "session: %s, flush_info->ses_hdl:%x, session->ses_hdl:%x",
CAM_IS_NULL_TO_STR(session), flush_info->session_hdl,
@ -4419,8 +4407,7 @@ int cam_req_mgr_flush_requests(
goto end;
}
link = (struct cam_req_mgr_core_link *)
cam_get_device_priv(flush_info->link_hdl);
link = cam_get_link_priv(flush_info->link_hdl);
if (!link || (link->link_hdl != flush_info->link_hdl)) {
CAM_ERR(CAM_CRM, "link: %s, flush_info->link_hdl:%x, link->link_hdl:%x",
CAM_IS_NULL_TO_STR(link), flush_info->link_hdl,
@ -4480,8 +4467,7 @@ int cam_req_mgr_link_control(struct cam_req_mgr_link_control *control)
mutex_lock(&g_crm_core_dev->crm_lock);
for (i = 0; i < control->num_links; i++) {
link = (struct cam_req_mgr_core_link *)
cam_get_device_priv(control->link_hdls[i]);
link = cam_get_link_priv(control->link_hdls[i]);
if (!link || (link->link_hdl != control->link_hdls[i])) {
CAM_ERR(CAM_CRM, "link: %s, control->link_hdl:%x, link->link_hdl:%x",
CAM_IS_NULL_TO_STR(link), control->link_hdls[i],
@ -4569,8 +4555,7 @@ int cam_req_mgr_dump_request(struct cam_dump_req_cmd *dump_req)
mutex_lock(&g_crm_core_dev->crm_lock);
/* session hdl's priv data is cam session struct */
session = (struct cam_req_mgr_core_session *)
cam_get_device_priv(dump_req->session_handle);
session = cam_get_session_priv(dump_req->session_handle);
if (!session || (session->session_hdl != dump_req->session_handle)) {
CAM_ERR(CAM_CRM, "session: %s, dump_req->ses_hdl:%x, session->ses_hdl:%x",
CAM_IS_NULL_TO_STR(session), dump_req->session_handle,
@ -4584,8 +4569,7 @@ int cam_req_mgr_dump_request(struct cam_dump_req_cmd *dump_req)
goto end;
}
link = (struct cam_req_mgr_core_link *)
cam_get_device_priv(dump_req->link_hdl);
link = cam_get_link_priv(dump_req->link_hdl);
if (!link || (link->link_hdl != dump_req->link_hdl)) {
CAM_ERR(CAM_CRM, "link: %s, dump_req->link_hdl:%x, link->link_hdl:%x",
CAM_IS_NULL_TO_STR(link), dump_req->link_hdl,

115
drivers/cam_req_mgr/cam_req_mgr_util.c
View file

@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2017-2021, The Linux Foundation. All rights reserved.
* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#define pr_fmt(fmt) "CAM-REQ-MGR_UTIL %s:%d " fmt, __func__, __LINE__
@ -37,28 +38,29 @@ int cam_req_mgr_util_init(void)
rc = -ENOMEM;
goto hdl_tbl_alloc_failed;
}
bitmap_size = BITS_TO_LONGS(CAM_REQ_MGR_MAX_HANDLES_V2) * sizeof(long);
hdl_tbl_local->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
if (!hdl_tbl_local->bitmap) {
rc = -ENOMEM;
goto bitmap_alloc_fail;
}
hdl_tbl_local->bits = bitmap_size * BITS_PER_BYTE;
spin_lock_bh(&hdl_tbl_lock);
if (hdl_tbl) {
spin_unlock_bh(&hdl_tbl_lock);
rc = -EEXIST;
kfree(hdl_tbl_local->bitmap);
kfree(hdl_tbl_local);
goto hdl_tbl_check_failed;
}
hdl_tbl = hdl_tbl_local;
spin_unlock_bh(&hdl_tbl_lock);
bitmap_size = BITS_TO_LONGS(CAM_REQ_MGR_MAX_HANDLES_V2) * sizeof(long);
hdl_tbl->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
if (!hdl_tbl->bitmap) {
rc = -ENOMEM;
goto bitmap_alloc_fail;
}
hdl_tbl->bits = bitmap_size * BITS_PER_BYTE;
return rc;
bitmap_alloc_fail:
kfree(hdl_tbl);
kfree(hdl_tbl_local);
hdl_tbl = NULL;
hdl_tbl_alloc_failed:
hdl_tbl_check_failed:
@ -125,6 +127,18 @@ static int32_t cam_get_free_handle_index(void)
return idx;
}
static void cam_dump_tbl_info(void)
{
int i;
for (i = 0; i < CAM_REQ_MGR_MAX_HANDLES_V2; i++)
CAM_INFO_RATE_LIMIT_CUSTOM(CAM_CRM, CAM_RATE_LIMIT_INTERVAL_5SEC,
CAM_REQ_MGR_MAX_HANDLES_V2,
"session_hdl=%x hdl_value=%x type=%d state=%d dev_id=%lld",
hdl_tbl->hdl[i].session_hdl, hdl_tbl->hdl[i].hdl_value,
hdl_tbl->hdl[i].type, hdl_tbl->hdl[i].state, hdl_tbl->hdl[i].dev_id);
}
int32_t cam_create_session_hdl(void *priv)
{
int idx;
@ -140,7 +154,8 @@ int32_t cam_create_session_hdl(void *priv)
idx = cam_get_free_handle_index();
if (idx < 0) {
CAM_ERR(CAM_CRM, "Unable to create session handle");
CAM_ERR(CAM_CRM, "Unable to create session handle(idx = %d)", idx);
cam_dump_tbl_info();
spin_unlock_bh(&hdl_tbl_lock);
return idx;
}
@ -182,8 +197,8 @@ int32_t cam_create_device_hdl(struct cam_create_dev_hdl *hdl_data)
idx = cam_get_free_handle_index();
if (idx < 0) {
CAM_ERR(CAM_CRM,
"Unable to create device handle(idx= %d)", idx);
CAM_ERR(CAM_CRM, "Unable to create device handle(idx= %d)", idx);
cam_dump_tbl_info();
spin_unlock_bh(&hdl_tbl_lock);
return idx;
}
@ -233,7 +248,43 @@ uint64_t cam_get_dev_handle_status(void)
return active_dev_hdls;
}
void *cam_get_device_priv(int32_t dev_hdl)
int32_t cam_create_link_hdl(struct cam_create_dev_hdl *hdl_data)
{
int idx;
int rand = 0;
int32_t handle;
spin_lock_bh(&hdl_tbl_lock);
if (!hdl_tbl) {
CAM_ERR(CAM_CRM, "Hdl tbl is NULL");
spin_unlock_bh(&hdl_tbl_lock);
return -EINVAL;
}
idx = cam_get_free_handle_index();
if (idx < 0) {
CAM_ERR(CAM_CRM, "Unable to create link handle(idx = %d)", idx);
cam_dump_tbl_info();
spin_unlock_bh(&hdl_tbl_lock);
return idx;
}
get_random_bytes(&rand, CAM_REQ_MGR_RND1_BYTES);
handle = GET_DEV_HANDLE(rand, HDL_TYPE_LINK, idx);
hdl_tbl->hdl[idx].session_hdl = hdl_data->session_hdl;
hdl_tbl->hdl[idx].hdl_value = handle;
hdl_tbl->hdl[idx].type = HDL_TYPE_LINK;
hdl_tbl->hdl[idx].state = HDL_ACTIVE;
hdl_tbl->hdl[idx].priv = hdl_data->priv;
hdl_tbl->hdl[idx].ops = NULL;
hdl_tbl->hdl[idx].dev_id = hdl_data->dev_id;
spin_unlock_bh(&hdl_tbl_lock);
CAM_DBG(CAM_CRM, "handle = %x", handle);
return handle;
}
void *cam_get_priv(int32_t dev_hdl, int handle_type)
{
int idx;
int type;
@ -264,7 +315,7 @@ void *cam_get_device_priv(int32_t dev_hdl)
}
type = CAM_REQ_MGR_GET_HDL_TYPE(dev_hdl);
if (HDL_TYPE_DEV != type && HDL_TYPE_SESSION != type) {
if (type != handle_type) {
CAM_ERR_RATE_LIMIT(CAM_CRM, "Invalid type:%d", type);
goto device_priv_fail;
}
@ -279,6 +330,34 @@ device_priv_fail:
return NULL;
}
void *cam_get_device_priv(int32_t dev_hdl)
{
void *priv;
priv = cam_get_priv(dev_hdl, HDL_TYPE_DEV);
return priv;
}
struct cam_req_mgr_core_session *cam_get_session_priv(int32_t dev_hdl)
{
struct cam_req_mgr_core_session *priv;
priv = (struct cam_req_mgr_core_session *)
cam_get_priv(dev_hdl, HDL_TYPE_SESSION);
return priv;
}
struct cam_req_mgr_core_link *cam_get_link_priv(int32_t dev_hdl)
{
struct cam_req_mgr_core_link *priv;
priv = (struct cam_req_mgr_core_link *)
cam_get_priv(dev_hdl, HDL_TYPE_LINK);
return priv;
}
void *cam_get_device_ops(int32_t dev_hdl)
{
int idx;
@ -303,7 +382,7 @@ void *cam_get_device_ops(int32_t dev_hdl)
}
type = CAM_REQ_MGR_GET_HDL_TYPE(dev_hdl);
if (HDL_TYPE_DEV != type && HDL_TYPE_SESSION != type) {
if (HDL_TYPE_DEV != type && HDL_TYPE_SESSION != type && HDL_TYPE_LINK != type) {
CAM_ERR(CAM_CRM, "Invalid type");
goto device_ops_fail;
}
@ -374,6 +453,12 @@ int cam_destroy_device_hdl(int32_t dev_hdl)
return cam_destroy_hdl(dev_hdl, HDL_TYPE_DEV);
}
int cam_destroy_link_hdl(int32_t dev_hdl)
{
CAM_DBG(CAM_CRM, "handle = %x", dev_hdl);
return cam_destroy_hdl(dev_hdl, HDL_TYPE_LINK);
}
int cam_destroy_session_hdl(int32_t dev_hdl)
{
return cam_destroy_hdl(dev_hdl, HDL_TYPE_SESSION);

55
drivers/cam_req_mgr/cam_req_mgr_util.h
View file

@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.
* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#ifndef _CAM_REQ_MGR_UTIL_API_H_
@ -9,6 +10,9 @@
#include <media/cam_req_mgr.h>
#include "cam_req_mgr_util_priv.h"
/* Interval for cam_info_rate_limit_custom() */
#define CAM_RATE_LIMIT_INTERVAL_5SEC 5
/**
* state of a handle(session/device)
* @HDL_FREE: free handle
@ -21,12 +25,14 @@ enum hdl_state {
/**
* handle type
* @HDL_TYPE_DEV: for device and link
* @HDL_TYPE_DEV: for device
* @HDL_TYPE_SESSION: for session
* @HDL_TYPE_LINK: for link
*/
enum hdl_type {
HDL_TYPE_DEV = 1,
HDL_TYPE_SESSION
HDL_TYPE_SESSION,
HDL_TYPE_LINK
};
/**
@ -103,8 +109,19 @@ int32_t cam_create_session_hdl(void *priv);
int32_t cam_create_device_hdl(struct cam_create_dev_hdl *hdl_data);
/**
* cam_get_device_priv() - get private data of a handle
* @dev_hdl: handle for a session/link/device
* cam_create_link_hdl() - create a link handle
* @hdl_data: session hdl, flags, ops and priv dara as input
*
* cam_req_mgr_core calls this function to get
* session and link handles
* KMD drivers calls this function to create
* a link handle. Returns a unique link handle
*/
int32_t cam_create_link_hdl(struct cam_create_dev_hdl *hdl_data);
/**
* cam_get_device_priv() - get private data of a device handle
* @dev_hdl: handle for a device
*
* cam_req_mgr_core and KMD drivers use this function to
* get private data of a handle. Returns a private data
@ -112,6 +129,26 @@ int32_t cam_create_device_hdl(struct cam_create_dev_hdl *hdl_data);
*/
void *cam_get_device_priv(int32_t dev_hdl);
/**
* cam_get_session_priv() - get private data of a session handle
* @dev_hdl: handle for a session
*
* cam_req_mgr_core and KMD drivers use this function to
* get private data of a handle. Returns a private data
* structure pointer.
*/
struct cam_req_mgr_core_session *cam_get_session_priv(int32_t dev_hdl);
/**
* cam_get_link_priv() - get private data of a link handle
* @dev_hdl: handle for a link
*
* cam_req_mgr_core and KMD drivers use this function to
* get private data of a handle. Returns a private data
* structure pointer.
*/
struct cam_req_mgr_core_link *cam_get_link_priv(int32_t dev_hdl);
/**
* cam_get_device_ops() - get ops of a handle
* @dev_hdl: handle for a session/link/device
@ -123,12 +160,20 @@ void *cam_get_device_ops(int32_t dev_hdl);
/**
* cam_destroy_device_hdl() - destroy device handle
* @dev_hdl: handle for a link/device.
* @dev_hdl: handle for a device.
*
* Returns success/failure
*/
int32_t cam_destroy_device_hdl(int32_t dev_hdl);
/**
* cam_destroy_link_hdl() - destroy link handle
* @dev_hdl: handle for a link.
*
* Returns success/failure
*/
int32_t cam_destroy_link_hdl(int32_t dev_hdl);
/**
* cam_destroy_session_hdl() - destroy device handle
* @dev_hdl: handle for a session