ide: check drive->present in ide_get_paired_drive()
* Change ide_get_paired_drive() to return NULL if peer device
is not present and update all users accordingly.
While at it:
* ide_get_paired_drive() -> ide_get_pair_dev()
* Use ide_get_pair_dev() in cs5530.c, sc1200.c and via82cxxx.c.
There should be no functional changes caused by this patch.
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/sc1200.c b/drivers/ide/pci/sc1200.c
index 695cc97..37326d2 100644
--- a/drivers/ide/pci/sc1200.c
+++ b/drivers/ide/pci/sc1200.c
@@ -104,11 +104,11 @@
static u8 sc1200_udma_filter(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
- ide_drive_t *mate = &hwif->drives[(drive->dn & 1) ^ 1];
+ ide_drive_t *mate = ide_get_pair_dev(drive);
u16 *mateid = mate->id;
u8 mask = hwif->ultra_mask;
- if (mate->present == 0)
+ if (mate == NULL)
goto out;
if (ata_id_has_dma(mateid) && __ide_dma_bad_drive(mate) == 0) {