ide: Fix siimage driver accessing beyond array boundary

The siimage uses an incorrect construct to access the other drive of a pair,
causing it to access beyond an array boundary on the secondary interface.

This fixes it by using the new ide_get_paired_drive() helper instead.

Bart: patch description fixes

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Andrew Morton <akpm@osdl.org>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

diff --git a/drivers/ide/pci/siimage.c b/drivers/ide/pci/siimage.c
index 85d0afd..8254260 100644 (file)
--- a/drivers/ide/pci/siimage.c
+++ b/drivers/ide/pci/siimage.c
@@ -180,7 +180,7 @@ static void sil_set_pio_mode(ide_drive_t *drive, u8 pio)
        const u16 data_speed[]  = { 0x328a, 0x2283, 0x1104, 0x10c3, 0x10c1 };
 
        ide_hwif_t *hwif        = HWIF(drive);
-       ide_drive_t *pair       = &hwif->drives[drive->dn ^ 1];
+       ide_drive_t *pair       = ide_get_paired_drive(drive);
        u32 speedt              = 0;
        u16 speedp              = 0;
        unsigned long addr      = siimage_seldev(drive, 0x04);