Commit 4bd14dd5 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville

iwlwifi: abstract out notification wait support

This will be sharable, but needs to live in the
op_mode as it is dependent on command processing.
Make a library out of the notification wait code.

Since I wrote all of the code originally and only
Intel employees changed it, we can also relicense
it to dual BSD/GPL.
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarWey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent f4720893
......@@ -14,6 +14,7 @@ iwlwifi-objs += iwl-1000.o
iwlwifi-objs += iwl-2000.o
iwlwifi-objs += iwl-pci.o
iwlwifi-objs += iwl-drv.o
iwlwifi-objs += iwl-notif-wait.o
iwlwifi-objs += iwl-trans-pcie.o iwl-trans-pcie-rx.o iwl-trans-pcie-tx.o
iwlwifi-$(CONFIG_IWLWIFI_DEBUGFS) += iwl-debugfs.o
......
......@@ -1142,9 +1142,7 @@ void iwl_setup_rx_handlers(struct iwl_priv *priv)
priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
/* set up notification wait support */
spin_lock_init(&priv->shrd->notif_wait_lock);
INIT_LIST_HEAD(&priv->shrd->notif_waits);
init_waitqueue_head(&priv->shrd->notif_waitq);
iwl_notification_wait_init(&priv->notif_wait);
/* Set up BT Rx handlers */
if (cfg(priv)->lib->bt_rx_handler_setup)
......@@ -1164,25 +1162,7 @@ int iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
* even if the RX handler consumes the RXB we have
* access to it in the notification wait entry.
*/
if (!list_empty(&priv->shrd->notif_waits)) {
struct iwl_notification_wait *w;
spin_lock(&priv->shrd->notif_wait_lock);
list_for_each_entry(w, &priv->shrd->notif_waits, list) {
if (w->cmd != pkt->hdr.cmd)
continue;
IWL_DEBUG_RX(priv,
"Notif: %s, 0x%02x - wake the callers up\n",
get_cmd_string(pkt->hdr.cmd),
pkt->hdr.cmd);
w->triggered = true;
if (w->fn)
w->fn(priv, pkt, w->fn_data);
}
spin_unlock(&priv->shrd->notif_wait_lock);
wake_up_all(&priv->shrd->notif_waitq);
}
iwl_notification_wait_notify(&priv->notif_wait, pkt);
if (priv->pre_rx_handler &&
priv->shrd->ucode_owner == IWL_OWNERSHIP_TM)
......
......@@ -60,7 +60,7 @@ static int iwlagn_disable_pan(struct iwl_priv *priv,
u8 old_dev_type = send->dev_type;
int ret;
iwl_init_notification_wait(priv->shrd, &disable_wait,
iwl_init_notification_wait(&priv->notif_wait, &disable_wait,
REPLY_WIPAN_DEACTIVATION_COMPLETE,
NULL, NULL);
......@@ -74,9 +74,10 @@ static int iwlagn_disable_pan(struct iwl_priv *priv,
if (ret) {
IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
iwl_remove_notification(priv->shrd, &disable_wait);
iwl_remove_notification(&priv->notif_wait, &disable_wait);
} else {
ret = iwl_wait_notification(priv->shrd, &disable_wait, HZ);
ret = iwl_wait_notification(&priv->notif_wait,
&disable_wait, HZ);
if (ret)
IWL_ERR(priv, "Timed out waiting for PAN disable\n");
}
......
......@@ -845,7 +845,7 @@ static void iwlagn_fw_error(struct iwl_priv *priv, bool ondemand)
/* Cancel currently queued command. */
clear_bit(STATUS_HCMD_ACTIVE, &priv->shrd->status);
iwl_abort_notification_waits(priv->shrd);
iwl_abort_notification_waits(&priv->notif_wait);
/* Keep the restart process from trying to send host
* commands by clearing the ready bit */
......
......@@ -51,6 +51,7 @@
#include "iwl-trans.h"
#include "iwl-shared.h"
#include "iwl-op-mode.h"
#include "iwl-notif-wait.h"
struct iwl_tx_queue;
......@@ -739,6 +740,8 @@ struct iwl_priv {
struct iwl_rx_cmd_buffer *rxb,
struct iwl_device_cmd *cmd);
struct iwl_notif_wait_data notif_wait;
struct ieee80211_supported_band bands[IEEE80211_NUM_BANDS];
/* spectrum measurement report caching */
......
/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
* USA
*
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
#include <linux/sched.h>
#include "iwl-notif-wait.h"
void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
{
spin_lock_init(&notif_wait->notif_wait_lock);
INIT_LIST_HEAD(&notif_wait->notif_waits);
init_waitqueue_head(&notif_wait->notif_waitq);
}
void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
struct iwl_rx_packet *pkt)
{
if (!list_empty(&notif_wait->notif_waits)) {
struct iwl_notification_wait *w;
spin_lock(&notif_wait->notif_wait_lock);
list_for_each_entry(w, &notif_wait->notif_waits, list) {
if (w->cmd != pkt->hdr.cmd)
continue;
w->triggered = true;
if (w->fn)
w->fn(notif_wait, pkt, w->fn_data);
}
spin_unlock(&notif_wait->notif_wait_lock);
wake_up_all(&notif_wait->notif_waitq);
}
}
void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
{
unsigned long flags;
struct iwl_notification_wait *wait_entry;
spin_lock_irqsave(&notif_wait->notif_wait_lock, flags);
list_for_each_entry(wait_entry, &notif_wait->notif_waits, list)
wait_entry->aborted = true;
spin_unlock_irqrestore(&notif_wait->notif_wait_lock, flags);
wake_up_all(&notif_wait->notif_waitq);
}
void
iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
struct iwl_notification_wait *wait_entry,
u8 cmd,
void (*fn)(struct iwl_notif_wait_data *notif_wait,
struct iwl_rx_packet *pkt, void *data),
void *fn_data)
{
wait_entry->fn = fn;
wait_entry->fn_data = fn_data;
wait_entry->cmd = cmd;
wait_entry->triggered = false;
wait_entry->aborted = false;
spin_lock_bh(&notif_wait->notif_wait_lock);
list_add(&wait_entry->list, &notif_wait->notif_waits);
spin_unlock_bh(&notif_wait->notif_wait_lock);
}
int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
struct iwl_notification_wait *wait_entry,
unsigned long timeout)
{
int ret;
ret = wait_event_timeout(notif_wait->notif_waitq,
wait_entry->triggered || wait_entry->aborted,
timeout);
spin_lock_bh(&notif_wait->notif_wait_lock);
list_del(&wait_entry->list);
spin_unlock_bh(&notif_wait->notif_wait_lock);
if (wait_entry->aborted)
return -EIO;
/* return value is always >= 0 */
if (ret <= 0)
return -ETIMEDOUT;
return 0;
}
void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
struct iwl_notification_wait *wait_entry)
{
spin_lock_bh(&notif_wait->notif_wait_lock);
list_del(&wait_entry->list);
spin_unlock_bh(&notif_wait->notif_wait_lock);
}
/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
* USA
*
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
#ifndef __iwl_notif_wait_h__
#define __iwl_notif_wait_h__
#include <linux/wait.h>
/* TODO: remove later */
#include "iwl-commands.h"
struct iwl_notif_wait_data {
struct list_head notif_waits;
spinlock_t notif_wait_lock;
wait_queue_head_t notif_waitq;
};
/**
* struct iwl_notification_wait - notification wait entry
* @list: list head for global list
* @fn: function called with the notification
* @cmd: command ID
*
* This structure is not used directly, to wait for a
* notification declare it on the stack, and call
* iwlagn_init_notification_wait() with appropriate
* parameters. Then do whatever will cause the ucode
* to notify the driver, and to wait for that then
* call iwlagn_wait_notification().
*
* Each notification is one-shot. If at some point we
* need to support multi-shot notifications (which
* can't be allocated on the stack) we need to modify
* the code for them.
*/
struct iwl_notification_wait {
struct list_head list;
void (*fn)(struct iwl_notif_wait_data *notif_data,
struct iwl_rx_packet *pkt, void *data);
void *fn_data;
u8 cmd;
bool triggered, aborted;
};
/* caller functions */
void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_data);
void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_data,
struct iwl_rx_packet *pkt);
void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_data);
/* user functions */
void __acquires(wait_entry)
iwl_init_notification_wait(struct iwl_notif_wait_data *notif_data,
struct iwl_notification_wait *wait_entry,
u8 cmd,
void (*fn)(struct iwl_notif_wait_data *notif_data,
struct iwl_rx_packet *pkt, void *data),
void *fn_data);
int __must_check __releases(wait_entry)
iwl_wait_notification(struct iwl_notif_wait_data *notif_data,
struct iwl_notification_wait *wait_entry,
unsigned long timeout);
void __releases(wait_entry)
iwl_remove_notification(struct iwl_notif_wait_data *notif_data,
struct iwl_notification_wait *wait_entry);
#endif /* __iwl_notif_wait_h__ */
......@@ -211,35 +211,6 @@ enum iwl_ucode_type {
IWL_UCODE_WOWLAN,
};
/**
* struct iwl_notification_wait - notification wait entry
* @list: list head for global list
* @fn: function called with the notification
* @cmd: command ID
*
* This structure is not used directly, to wait for a
* notification declare it on the stack, and call
* iwlagn_init_notification_wait() with appropriate
* parameters. Then do whatever will cause the ucode
* to notify the driver, and to wait for that then
* call iwlagn_wait_notification().
*
* Each notification is one-shot. If at some point we
* need to support multi-shot notifications (which
* can't be allocated on the stack) we need to modify
* the code for them.
*/
struct iwl_notification_wait {
struct list_head list;
void (*fn)(struct iwl_priv *priv, struct iwl_rx_packet *pkt,
void *data);
void *fn_data;
u8 cmd;
bool triggered, aborted;
};
/**
* enum iwl_pa_type - Power Amplifier type
* @IWL_PA_SYSTEM: based on uCode configuration
......@@ -400,9 +371,6 @@ struct iwl_cfg {
* @wait_command_queue: the wait_queue for SYNC host command nad uCode load
* @eeprom: pointer to the eeprom/OTP image
* @ucode_type: indicator of loaded ucode image
* @notif_waits: things waiting for notification
* @notif_wait_lock: lock protecting notification
* @notif_waitq: head of notification wait queue
* @device_pointers: pointers to ucode event tables
*/
struct iwl_shared {
......@@ -428,11 +396,6 @@ struct iwl_shared {
/* ucode related variables */
enum iwl_ucode_type ucode_type;
/* notification wait support */
struct list_head notif_waits;
spinlock_t notif_wait_lock;
wait_queue_head_t notif_waitq;
struct {
u32 error_event_table;
u32 log_event_table;
......@@ -462,24 +425,6 @@ int iwlagn_hw_valid_rtc_data_addr(u32 addr);
void iwl_nic_config(struct iwl_priv *priv);
const char *get_cmd_string(u8 cmd);
/* notification wait support */
void iwl_abort_notification_waits(struct iwl_shared *shrd);
void __acquires(wait_entry)
iwl_init_notification_wait(struct iwl_shared *shrd,
struct iwl_notification_wait *wait_entry,
u8 cmd,
void (*fn)(struct iwl_priv *priv,
struct iwl_rx_packet *pkt,
void *data),
void *fn_data);
int __must_check __releases(wait_entry)
iwl_wait_notification(struct iwl_shared *shrd,
struct iwl_notification_wait *wait_entry,
unsigned long timeout);
void __releases(wait_entry)
iwl_remove_notification(struct iwl_shared *shrd,
struct iwl_notification_wait *wait_entry);
#define IWL_CMD(x) case x: return #x
/*****************************************************
......
......@@ -418,7 +418,7 @@ static int iwl_testmode_cfg_init_calib(struct iwl_priv *priv)
struct iwl_notification_wait calib_wait;
int ret;
iwl_init_notification_wait(priv->shrd, &calib_wait,
iwl_init_notification_wait(&priv->notif_wait, &calib_wait,
CALIBRATION_COMPLETE_NOTIFICATION,
NULL, NULL);
ret = iwl_init_alive_start(priv);
......@@ -427,14 +427,14 @@ static int iwl_testmode_cfg_init_calib(struct iwl_priv *priv)
goto cfg_init_calib_error;
}
ret = iwl_wait_notification(priv->shrd, &calib_wait, 2 * HZ);
ret = iwl_wait_notification(&priv->notif_wait, &calib_wait, 2 * HZ);
if (ret)
IWL_ERR(priv, "Error detecting"
" CALIBRATION_COMPLETE_NOTIFICATION: %d\n", ret);
return ret;
cfg_init_calib_error:
iwl_remove_notification(priv->shrd, &calib_wait);
iwl_remove_notification(&priv->notif_wait, &calib_wait);
return ret;
}
......
......@@ -29,7 +29,6 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include "iwl-dev.h"
#include "iwl-core.h"
......@@ -434,10 +433,12 @@ struct iwl_alive_data {
u8 subtype;
};
static void iwl_alive_fn(struct iwl_priv *priv,
static void iwl_alive_fn(struct iwl_notif_wait_data *notif_wait,
struct iwl_rx_packet *pkt,
void *data)
{
struct iwl_priv *priv =
container_of(notif_wait, struct iwl_priv, notif_wait);
struct iwl_alive_data *alive_data = data;
struct iwl_alive_resp *palive;
......@@ -457,70 +458,6 @@ static void iwl_alive_fn(struct iwl_priv *priv,
alive_data->valid = palive->is_valid == UCODE_VALID_OK;
}
/* notification wait support */
void iwl_init_notification_wait(struct iwl_shared *shrd,
struct iwl_notification_wait *wait_entry,
u8 cmd,
void (*fn)(struct iwl_priv *priv,
struct iwl_rx_packet *pkt,
void *data),
void *fn_data)
{
wait_entry->fn = fn;
wait_entry->fn_data = fn_data;
wait_entry->cmd = cmd;
wait_entry->triggered = false;
wait_entry->aborted = false;
spin_lock_bh(&shrd->notif_wait_lock);
list_add(&wait_entry->list, &shrd->notif_waits);
spin_unlock_bh(&shrd->notif_wait_lock);
}
int iwl_wait_notification(struct iwl_shared *shrd,
struct iwl_notification_wait *wait_entry,
unsigned long timeout)
{
int ret;
ret = wait_event_timeout(shrd->notif_waitq,
wait_entry->triggered || wait_entry->aborted,
timeout);
spin_lock_bh(&shrd->notif_wait_lock);
list_del(&wait_entry->list);
spin_unlock_bh(&shrd->notif_wait_lock);
if (wait_entry->aborted)
return -EIO;
/* return value is always >= 0 */
if (ret <= 0)
return -ETIMEDOUT;
return 0;
}
void iwl_remove_notification(struct iwl_shared *shrd,
struct iwl_notification_wait *wait_entry)
{
spin_lock_bh(&shrd->notif_wait_lock);
list_del(&wait_entry->list);
spin_unlock_bh(&shrd->notif_wait_lock);
}
void iwl_abort_notification_waits(struct iwl_shared *shrd)
{
unsigned long flags;
struct iwl_notification_wait *wait_entry;
spin_lock_irqsave(&shrd->notif_wait_lock, flags);
list_for_each_entry(wait_entry, &shrd->notif_waits, list)
wait_entry->aborted = true;
spin_unlock_irqrestore(&shrd->notif_wait_lock, flags);
wake_up_all(&shrd->notif_waitq);
}
#define UCODE_ALIVE_TIMEOUT HZ
#define UCODE_CALIB_TIMEOUT (2*HZ)
......@@ -540,13 +477,13 @@ int iwl_load_ucode_wait_alive(struct iwl_priv *priv,
if (!fw)
return -EINVAL;
iwl_init_notification_wait(priv->shrd, &alive_wait, REPLY_ALIVE,
iwl_init_notification_wait(&priv->notif_wait, &alive_wait, REPLY_ALIVE,
iwl_alive_fn, &alive_data);
ret = iwl_trans_start_fw(trans(priv), fw);
if (ret) {
priv->shrd->ucode_type = old_type;
iwl_remove_notification(priv->shrd, &alive_wait);
iwl_remove_notification(&priv->notif_wait, &alive_wait);
return ret;
}
......@@ -554,7 +491,7 @@ int iwl_load_ucode_wait_alive(struct iwl_priv *priv,
* Some things may run in the background now, but we
* just wait for the ALIVE notification here.
*/
ret = iwl_wait_notification(priv->shrd, &alive_wait,
ret = iwl_wait_notification(&priv->notif_wait, &alive_wait,
UCODE_ALIVE_TIMEOUT);
if (ret) {
priv->shrd->ucode_type = old_type;
......@@ -608,7 +545,7 @@ int iwl_run_init_ucode(struct iwl_priv *priv)
if (priv->shrd->ucode_type != IWL_UCODE_NONE)
return 0;
iwl_init_notification_wait(priv->shrd, &calib_wait,
iwl_init_notification_wait(&priv->notif_wait, &calib_wait,
CALIBRATION_COMPLETE_NOTIFICATION,
NULL, NULL);
......@@ -625,13 +562,13 @@ int iwl_run_init_ucode(struct iwl_priv *priv)
* Some things may run in the background now, but we
* just wait for the calibration complete notification.
*/
ret = iwl_wait_notification(priv->shrd, &calib_wait,
ret = iwl_wait_notification(&priv->notif_wait, &calib_wait,
UCODE_CALIB_TIMEOUT);
goto out;
error:
iwl_remove_notification(priv->shrd, &calib_wait);
iwl_remove_notification(&priv->notif_wait, &calib_wait);
out:
/* Whatever happened, stop the device */
iwl_trans_stop_device(trans(priv));
......
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