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>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/ide/pci/siimage.c b/drivers/ide/pci/siimage.c
index 7b5bd8729f64..83c36e6035fa 100644
--- a/drivers/ide/pci/siimage.c
+++ b/drivers/ide/pci/siimage.c
@@ -245,7 +245,7 @@ static void sil_set_pio_mode(ide_drive_t *drive, u8 pio)
 
         ide_hwif_t *hwif        = HWIF(drive);
         struct pci_dev *dev     = to_pci_dev(hwif->dev);
-        ide_drive_t *pair       = ide_get_paired_drive(drive);
+        ide_drive_t *pair       = ide_get_pair_dev(drive);
         u32 speedt              = 0;
         u16 speedp              = 0;
         unsigned long addr      = siimage_seldev(drive, 0x04);
@@ -259,7 +259,7 @@ static void sil_set_pio_mode(ide_drive_t *drive, u8 pio)
         u8 unit                 = drive->select.b.unit;
 
         /* trim *taskfile* PIO to the slowest of the master/slave */
-        if (pair->present) {
+        if (pair) {
                 u8 pair_pio = ide_get_best_pio_mode(pair, 255, 4);
 
                 if (pair_pio < tf_pio)