linux-kernel - [PATCH] ide: use __generic_unplug_device() in ide_do_drive

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Date:	Tue, 27 May 2008 22:01:57 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	linux-ide@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Borislav Petkov <petkovbb@...il.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: [PATCH] ide: use __generic_unplug_device() in ide_do_drive_cmd() (take 2)

* Call __elv_add_request() with 'plug' == 1 (so the device will be
  plugged) and then use __generic_unplug_device() instead of calling
  ide_do_request() directly.

v2:
* For blk_pm_resume_request() requests the queue is stopped so we
  need to call ->request_fn explicitly.

  Thanks to:
  - Rafael for reporting/bisecting the bug
  - Borislav/Rafael for testing the fix

This is a preparation for converting IDE to use blk_execute_rq().

Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc: Borislav Petkov <petkovbb@...il.com>
Cc: Jens Axboe <jens.axboe@...cle.com>
Cc: "Rafael J. Wysocki" <rjw@...k.pl>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
replacement patch

 drivers/ide/ide-io.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Index: b/drivers/ide/ide-io.c
===================================================================
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -1606,8 +1606,11 @@ int ide_do_drive_cmd (ide_drive_t *drive
 	spin_lock_irqsave(&ide_lock, flags);
 	if (action == ide_preempt)
 		hwgroup->rq = NULL;
-	__elv_add_request(drive->queue, rq, where, 0);
-	ide_do_request(hwgroup, IDE_NO_IRQ);
+	__elv_add_request(drive->queue, rq, where, 1);
+	__generic_unplug_device(drive->queue);
+	/* the queue is stopped so it won't be plugged+unplugged */
+	if (blk_pm_resume_request(rq))
+		do_ide_request(drive->queue);
 	spin_unlock_irqrestore(&ide_lock, flags);
 
 	err = 0;
--
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