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Subject[PATCH 2/2] ide: ide_unregister() locking bugfix
Date
Holding ide_lock for ide_release_dma_engine() call is unnecessary
and triggers WARN_ON(irqs_disabled()) in dma_free_coherent().

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
drivers/ide/ide.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

Index: b/drivers/ide/ide.c
===================================================================
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -352,15 +352,15 @@ void ide_unregister(ide_hwif_t *hwif)
blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
kfree(hwif->sg_table);
unregister_blkdev(hwif->major, hwif->name);
- spin_lock_irq(&ide_lock);

if (hwif->dma_base)
ide_release_dma_engine(hwif);

+ spin_lock_irq(&ide_lock);
/* restore hwif data to pristine status */
ide_init_port_data(hwif, hwif->index);
-
spin_unlock_irq(&ide_lock);
+
mutex_unlock(&ide_cfg_mtx);
}


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