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Revert "ide: improve handling of Power Management requests"

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This reverts commit a1317f714a.
This commit is contained in:
David S. Miller 2009-07-06 12:39:27 -07:00
parent e18ed145c7
commit 3503e0acbf
1 changed files with 32 additions and 22 deletions
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54
drivers/ide/ide-io.c
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@ -466,14 +466,10 @@ void do_ide_request(struct request_queue *q)
if (!ide_lock_port(hwif)) {
ide_hwif_t *prev_port;
WARN_ON_ONCE(hwif->rq);
repeat:
prev_port = hwif->host->cur_port;
if (drive->dev_flags & IDE_DFLAG_BLOCKED)
rq = hwif->rq;
else
WARN_ON_ONCE(hwif->rq);
if (drive->dev_flags & IDE_DFLAG_SLEEPING &&
time_after(drive->sleep, jiffies)) {
ide_unlock_port(hwif);
@ -500,29 +496,43 @@ repeat:
hwif->cur_dev = drive;
drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED);
if (rq == NULL) {
spin_unlock_irq(&hwif->lock);
spin_lock_irq(q->queue_lock);
/*
* we know that the queue isn't empty, but this can
* happen if ->prep_rq_fn() decides to kill a request
*/
spin_unlock_irq(&hwif->lock);
spin_lock_irq(q->queue_lock);
/*
* we know that the queue isn't empty, but this can happen
* if the q->prep_rq_fn() decides to kill a request
*/
if (!rq)
rq = blk_fetch_request(drive->queue);
spin_unlock_irq(q->queue_lock);
spin_lock_irq(&hwif->lock);
if (rq == NULL) {
ide_unlock_port(hwif);
goto out;
}
spin_unlock_irq(q->queue_lock);
spin_lock_irq(&hwif->lock);
if (!rq) {
ide_unlock_port(hwif);
goto out;
}
/*
* Sanity: don't accept a request that isn't a PM request
* if we are currently power managed.
* if we are currently power managed. This is very important as
* blk_stop_queue() doesn't prevent the blk_fetch_request()
* above to return us whatever is in the queue. Since we call
* ide_do_request() ourselves, we end up taking requests while
* the queue is blocked...
*
* We let requests forced at head of queue with ide-preempt
* though. I hope that doesn't happen too much, hopefully not
* unless the subdriver triggers such a thing in its own PM
* state machine.
*/
BUG_ON((drive->dev_flags & IDE_DFLAG_BLOCKED) &&
blk_pm_request(rq) == 0);
if ((drive->dev_flags & IDE_DFLAG_BLOCKED) &&
blk_pm_request(rq) == 0 &&
(rq->cmd_flags & REQ_PREEMPT) == 0) {
/* there should be no pending command at this point */
ide_unlock_port(hwif);
goto plug_device;
}
hwif->rq = rq;