/***
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*
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* rtmac/tdma/tdma_worker.c
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*
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* RTmac - real-time networking media access control subsystem
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* Copyright (C) 2002 Marc Kleine-Budde <kleine-budde@gmx.de>,
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* 2003-2005 Jan Kiszka <Jan.Kiszka@web.de>
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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 the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <rtmac/rtmac_proto.h>
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#include <rtmac/tdma/tdma_proto.h>
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static void do_slot_job(struct tdma_priv *tdma, struct tdma_slot *job,
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rtdm_lockctx_t lockctx)
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{
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struct rtskb *rtskb;
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if ((job->period != 1) &&
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(tdma->current_cycle % job->period != job->phasing))
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return;
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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/* wait for slot begin, then send one pending packet */
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rtdm_task_sleep_abs(tdma->current_cycle_start + SLOT_JOB(job)->offset,
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RTDM_TIMERMODE_REALTIME);
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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rtskb = __rtskb_prio_dequeue(SLOT_JOB(job)->queue);
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if (!rtskb)
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return;
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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rtmac_xmit(rtskb);
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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}
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static void do_xmit_sync_job(struct tdma_priv *tdma, rtdm_lockctx_t lockctx)
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{
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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/* wait for beginning of next cycle, then send sync */
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rtdm_task_sleep_abs(tdma->current_cycle_start + tdma->cycle_period,
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RTDM_TIMERMODE_REALTIME);
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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tdma->current_cycle++;
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tdma->current_cycle_start += tdma->cycle_period;
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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tdma_xmit_sync_frame(tdma);
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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}
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static void do_backup_sync_job(struct tdma_priv *tdma, rtdm_lockctx_t lockctx)
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{
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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/* wait for backup slot */
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rtdm_task_sleep_abs(tdma->current_cycle_start + tdma->backup_sync_inc,
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RTDM_TIMERMODE_REALTIME);
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/* take over sync transmission if all earlier masters failed */
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if (!test_and_clear_bit(TDMA_FLAG_RECEIVED_SYNC, &tdma->flags)) {
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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tdma->current_cycle++;
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tdma->current_cycle_start += tdma->cycle_period;
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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tdma_xmit_sync_frame(tdma);
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set_bit(TDMA_FLAG_BACKUP_ACTIVE, &tdma->flags);
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} else
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clear_bit(TDMA_FLAG_BACKUP_ACTIVE, &tdma->flags);
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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}
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static struct tdma_job *do_request_cal_job(struct tdma_priv *tdma,
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struct tdma_request_cal *job,
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rtdm_lockctx_t lockctx)
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{
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struct rt_proc_call *call;
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struct tdma_job *prev_job;
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int err;
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if ((job->period != 1) &&
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(tdma->current_cycle % job->period != job->phasing))
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return &job->head;
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/* remove job until we get a reply */
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__list_del(job->head.entry.prev, job->head.entry.next);
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job->head.ref_count--;
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prev_job = tdma->current_job =
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list_entry(job->head.entry.prev, struct tdma_job, entry);
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prev_job->ref_count++;
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tdma->job_list_revision++;
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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rtdm_task_sleep_abs(tdma->current_cycle_start + job->offset,
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RTDM_TIMERMODE_REALTIME);
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err = tdma_xmit_request_cal_frame(
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tdma, tdma->current_cycle + job->period, job->offset);
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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/* terminate call on error */
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if (err < 0) {
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call = tdma->calibration_call;
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tdma->calibration_call = NULL;
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if (call) {
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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rtpc_complete_call(call, err);
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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}
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}
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return prev_job;
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}
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static struct tdma_job *do_reply_cal_job(struct tdma_priv *tdma,
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struct tdma_reply_cal *job,
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rtdm_lockctx_t lockctx)
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{
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struct tdma_job *prev_job;
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if (job->reply_cycle > tdma->current_cycle)
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return &job->head;
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/* remove the job */
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__list_del(job->head.entry.prev, job->head.entry.next);
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job->head.ref_count--;
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prev_job = tdma->current_job =
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list_entry(job->head.entry.prev, struct tdma_job, entry);
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prev_job->ref_count++;
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tdma->job_list_revision++;
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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if (job->reply_cycle == tdma->current_cycle) {
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/* send reply in the assigned slot */
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rtdm_task_sleep_abs(tdma->current_cycle_start +
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job->reply_offset,
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RTDM_TIMERMODE_REALTIME);
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rtmac_xmit(job->reply_rtskb);
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} else {
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/* cleanup if cycle already passed */
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kfree_rtskb(job->reply_rtskb);
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}
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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return prev_job;
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}
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void tdma_worker(void *arg)
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{
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struct tdma_priv *tdma = arg;
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struct tdma_job *job;
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rtdm_lockctx_t lockctx;
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int ret;
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ret = rtdm_event_wait(&tdma->worker_wakeup);
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if (ret)
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return;
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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job = tdma->first_job;
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while (!rtdm_task_should_stop()) {
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job->ref_count++;
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switch (job->id) {
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case WAIT_ON_SYNC:
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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ret = rtdm_event_wait(&tdma->sync_event);
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if (ret)
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return;
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rtdm_lock_get_irqsave(&tdma->lock, lockctx);
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break;
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case XMIT_REQ_CAL:
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job = do_request_cal_job(tdma, REQUEST_CAL_JOB(job),
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lockctx);
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break;
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#ifdef CONFIG_XENO_DRIVERS_NET_TDMA_MASTER
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case XMIT_SYNC:
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do_xmit_sync_job(tdma, lockctx);
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break;
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case BACKUP_SYNC:
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do_backup_sync_job(tdma, lockctx);
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break;
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case XMIT_RPL_CAL:
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job = do_reply_cal_job(tdma, REPLY_CAL_JOB(job),
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lockctx);
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break;
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#endif /* CONFIG_XENO_DRIVERS_NET_TDMA_MASTER */
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default:
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do_slot_job(tdma, SLOT_JOB(job), lockctx);
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break;
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}
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job->ref_count--;
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job = tdma->current_job =
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list_entry(job->entry.next, struct tdma_job, entry);
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}
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rtdm_lock_put_irqrestore(&tdma->lock, lockctx);
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}
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