[PATCH] ide: fix ide_toggle_bounce() to not try to bounce if we have an IOMMU

The following patch fixes a crash caused by attempting to bounce buffer
when an IDE CD-ROM is used on a machine with an IO-MMU. [At least, this
patch fixes things so I can use my IDE CD-ROM behind an ns87415 on a 
HP PA-RISC workstation.]

Signed-off-by: James Bottomley <jejb@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index b09a6537c7a8..41d46dbe6c24 100644
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -410,10 +410,10 @@ void ide_toggle_bounce(ide_drive_t *drive, int on)
 {
         u64 addr = BLK_BOUNCE_HIGH;     /* dma64_addr_t */
 
-        if (on && drive->media == ide_disk) {
-                if (!PCI_DMA_BUS_IS_PHYS)
-                        addr = BLK_BOUNCE_ANY;
-                else if (HWIF(drive)->pci_dev)
+        if (!PCI_DMA_BUS_IS_PHYS) {
+                addr = BLK_BOUNCE_ANY;
+        } else if (on && drive->media == ide_disk) {
+                if (HWIF(drive)->pci_dev)
                         addr = HWIF(drive)->pci_dev->dma_mask;
         }