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Commit a1317f71 authored by Bartlomiej Zolnierkiewicz's avatar Bartlomiej Zolnierkiewicz Committed by David S. Miller
Browse files

ide: improve handling of Power Management requests 



Make hwif->rq point to PM request during PM sequence and do not allow
any other types of requests to slip in (the old comment was never correct
as there should be no such requests generated during PM sequence).

Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ba9413bd

drivers/ide/ide-io.c

+22 −32
Original line number Diff line number Diff line
@@ -476,10 +476,14 @@ 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);
@@ -506,43 +510,29 @@ void do_ide_request(struct request_queue *q) 
		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 the q->prep_rq_fn() decides to kill a request

			 * we know that the queue isn't empty, but this can

			 * happen if ->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) {

			if (rq == NULL) {

				ide_unlock_port(hwif);

				goto out;

			}

		}



		/*

		 * Sanity: don't accept a request that isn't a PM request

		 * 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.

		 * if we are currently power managed.

		 */

		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;

		}

		BUG_ON((drive->dev_flags & IDE_DFLAG_BLOCKED) &&

		       blk_pm_request(rq) == 0);



		hwif->rq = rq;