linux-kernel - [PATCH] ide: fix locking in drive_release

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Date:	Mon, 23 Feb 2009 23:38:40 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	linux-ide@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Stanislaw Gruszka <stf_xl@...pl>
Subject: [PATCH] ide: fix locking in drive_release_dev()

From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: [PATCH] ide: fix locking in drive_release_dev()

* Request queue cleanup should happen before freeing drive->id
  and marking device as non-present.  Fix it.

* Remove superfluous hwif->lock acquiring/releasing.

Cc: Stanislaw Gruszka <stf_xl@...pl>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
I noticed this while investigating the host driver removal
issue -- lets also fix/test this one while we are at it...

 drivers/ide/ide-probe.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

Index: b/drivers/ide/ide-probe.c
===================================================================
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -937,20 +937,16 @@ EXPORT_SYMBOL_GPL(ide_init_disk);
 static void drive_release_dev (struct device *dev)
 {
 	ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
-	ide_hwif_t *hwif = drive->hwif;
 
 	ide_proc_unregister_device(drive);
 
-	spin_lock_irq(&hwif->lock);
+	blk_cleanup_queue(drive->queue);
+	drive->queue = NULL;
+
 	kfree(drive->id);
 	drive->id = NULL;
+
 	drive->dev_flags &= ~IDE_DFLAG_PRESENT;
-	/* Messed up locking ... */
-	spin_unlock_irq(&hwif->lock);
-	blk_cleanup_queue(drive->queue);
-	spin_lock_irq(&hwif->lock);
-	drive->queue = NULL;
-	spin_unlock_irq(&hwif->lock);
 
 	complete(&drive->gendev_rel_comp);
 }
--
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