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[MTD] Finish conversion mtd_blkdevs to use the kthread API 

Remove waitqueue, 'exiting' flag and completion; use kthread APIs instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Christoph Hellwig 2007-04-22 20:40:57 +01:00 committed by David Woodhouse
parent a491486a20
commit 3e67fe4543
1 changed files with 9 additions and 23 deletions
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32
drivers/mtd/mtd_blkdevs.c
View File

@ -29,9 +29,7 @@ extern struct mutex mtd_table_mutex;
extern struct mtd_info *mtd_table[];
struct mtd_blkcore_priv {
struct completion thread_dead;
int exiting;
wait_queue_head_t thread_wq;
struct task_struct *thread;
struct request_queue *rq;
spinlock_t queue_lock;
};
@ -85,26 +83,18 @@ static int mtd_blktrans_thread(void *arg)
current->flags |= PF_MEMALLOC | PF_NOFREEZE;
spin_lock_irq(rq->queue_lock);
while (!tr->blkcore_priv->exiting) {
while (!kthread_should_stop()) {
struct request *req;
struct mtd_blktrans_dev *dev;
int res = 0;
DECLARE_WAITQUEUE(wait, current);
req = elv_next_request(rq);
if (!req) {
add_wait_queue(&tr->blkcore_priv->thread_wq, &wait);
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irq(rq->queue_lock);
schedule();
remove_wait_queue(&tr->blkcore_priv->thread_wq, &wait);
spin_lock_irq(rq->queue_lock);
continue;
}
@ -123,13 +113,13 @@ static int mtd_blktrans_thread(void *arg)
}
spin_unlock_irq(rq->queue_lock);
complete_and_exit(&tr->blkcore_priv->thread_dead, 0);
return 0;
}
static void mtd_blktrans_request(struct request_queue *rq)
{
struct mtd_blktrans_ops *tr = rq->queuedata;
wake_up(&tr->blkcore_priv->thread_wq);
wake_up_process(tr->blkcore_priv->thread);
}
@ -355,7 +345,6 @@ static struct mtd_notifier blktrans_notifier = {
int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
{
struct task_struct *task;
int ret, i;
/* Register the notifier if/when the first device type is
@ -379,8 +368,6 @@ int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
return ret;
}
spin_lock_init(&tr->blkcore_priv->queue_lock);
init_completion(&tr->blkcore_priv->thread_dead);
init_waitqueue_head(&tr->blkcore_priv->thread_wq);
tr->blkcore_priv->rq = blk_init_queue(mtd_blktrans_request, &tr->blkcore_priv->queue_lock);
if (!tr->blkcore_priv->rq) {
@ -394,13 +381,14 @@ int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
blk_queue_hardsect_size(tr->blkcore_priv->rq, tr->blksize);
tr->blkshift = ffs(tr->blksize) - 1;
task = kthread_run(mtd_blktrans_thread, tr, "%sd", tr->name);
if (IS_ERR(task)) {
tr->blkcore_priv->thread = kthread_run(mtd_blktrans_thread, tr,
"%sd", tr->name);
if (IS_ERR(tr->blkcore_priv->thread)) {
blk_cleanup_queue(tr->blkcore_priv->rq);
unregister_blkdev(tr->major, tr->name);
kfree(tr->blkcore_priv);
mutex_unlock(&mtd_table_mutex);
return PTR_ERR(task);
return PTR_ERR(tr->blkcore_priv->thread);
}
INIT_LIST_HEAD(&tr->devs);
@ -423,9 +411,7 @@ int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr)
mutex_lock(&mtd_table_mutex);
/* Clean up the kernel thread */
tr->blkcore_priv->exiting = 1;
wake_up(&tr->blkcore_priv->thread_wq);
wait_for_completion(&tr->blkcore_priv->thread_dead);
kthread_stop(tr->blkcore_priv->thread);
/* Remove it from the list of active majors */
list_del(&tr->list);