db662d4786
Sometimes, for example when we ask the uCode for calibration, we wait for the "complete" response while we also need the results that are sent in other, interim, notifications. Currently we handle this by installing an RX handler globally, but that isn't needed as this is the only time we want to use these notifications. So in order to be able to simplify at least future code that does the same, extend the notification wait framework to allow you to wait for multiple commands and decide based on the command whether the wait finished. While at it, also fix a race that can then become relevant -- if the wait function has returned true once it shouldn't be called again, today this can happen due to races between the triggering and the wakeup. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
138 lines
5.2 KiB
C
138 lines
5.2 KiB
C
/******************************************************************************
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
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* USA
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*
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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* BSD LICENSE
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*
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* Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* distribution.
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* * Neither the name Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*****************************************************************************/
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#ifndef __iwl_notif_wait_h__
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#define __iwl_notif_wait_h__
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#include <linux/wait.h>
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#include "iwl-trans.h"
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struct iwl_notif_wait_data {
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struct list_head notif_waits;
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spinlock_t notif_wait_lock;
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wait_queue_head_t notif_waitq;
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};
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#define MAX_NOTIF_CMDS 5
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/**
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* struct iwl_notification_wait - notification wait entry
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* @list: list head for global list
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* @fn: Function called with the notification. If the function
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* returns true, the wait is over, if it returns false then
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* the waiter stays blocked. If no function is given, any
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* of the listed commands will unblock the waiter.
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* @cmds: command IDs
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* @n_cmds: number of command IDs
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* @triggered: waiter should be woken up
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* @aborted: wait was aborted
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*
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* This structure is not used directly, to wait for a
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* notification declare it on the stack, and call
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* iwlagn_init_notification_wait() with appropriate
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* parameters. Then do whatever will cause the ucode
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* to notify the driver, and to wait for that then
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* call iwlagn_wait_notification().
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*
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* Each notification is one-shot. If at some point we
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* need to support multi-shot notifications (which
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* can't be allocated on the stack) we need to modify
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* the code for them.
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*/
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struct iwl_notification_wait {
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struct list_head list;
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bool (*fn)(struct iwl_notif_wait_data *notif_data,
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struct iwl_rx_packet *pkt, void *data);
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void *fn_data;
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u8 cmds[MAX_NOTIF_CMDS];
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u8 n_cmds;
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bool triggered, aborted;
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};
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/* caller functions */
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void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_data);
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void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_data,
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struct iwl_rx_packet *pkt);
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void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_data);
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/* user functions */
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void __acquires(wait_entry)
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iwl_init_notification_wait(struct iwl_notif_wait_data *notif_data,
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struct iwl_notification_wait *wait_entry,
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const u8 *cmds, int n_cmds,
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bool (*fn)(struct iwl_notif_wait_data *notif_data,
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struct iwl_rx_packet *pkt, void *data),
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void *fn_data);
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int __must_check __releases(wait_entry)
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iwl_wait_notification(struct iwl_notif_wait_data *notif_data,
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struct iwl_notification_wait *wait_entry,
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unsigned long timeout);
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void __releases(wait_entry)
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iwl_remove_notification(struct iwl_notif_wait_data *notif_data,
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struct iwl_notification_wait *wait_entry);
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#endif /* __iwl_notif_wait_h__ */
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