1 files changed, 9 insertions, 2 deletions

diff --git a/include/linux/ide.h b/include/linux/ide.h
index f00086b10be3..4cecd923fc79 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -753,7 +753,7 @@ typedef struct hwif_s {
 
         unsigned long   sata_scr[SATA_NR_PORTS];
 
-        ide_drive_t     *devices[MAX_DRIVES];
+        ide_drive_t     *devices[MAX_DRIVES + 1];
 
         u8 major;       /* our major number */
         u8 index;       /* 0 for ide0; 1 for ide1; ... */
@@ -861,7 +861,7 @@ typedef struct hwif_s {
 #define MAX_HOST_PORTS 4
 
 struct ide_host {
-        ide_hwif_t      *ports[MAX_HOST_PORTS];
+        ide_hwif_t      *ports[MAX_HOST_PORTS + 1];
         unsigned int    n_ports;
         struct device   *dev[2];
         unsigned int    (*init_chipset)(struct pci_dev *);
@@ -1604,4 +1604,11 @@ static inline ide_drive_t *ide_get_pair_dev(ide_drive_t *drive)
 
         return (peer->dev_flags & IDE_DFLAG_PRESENT) ? peer : NULL;
 }
+
+#define ide_port_for_each_dev(i, dev, port) \
+        for ((i) = 0; ((dev) = (port)->devices[i]) || (i) < MAX_DRIVES; (i)++)
+
+#define ide_host_for_each_port(i, port, host) \
+        for ((i) = 0; ((port) = (host)->ports[i]) || (i) < MAX_HOST_PORTS; (i)++)
+
 #endif /* _IDE_H */