ide: add ide_device_{get,put}() helpers

* Add 'struct ide_host *host' field to ide_hwif_t and set it
  in ide_host_alloc_all().

* Add ide_device_{get,put}() helpers loosely based on SCSI's
  scsi_device_{get,put}() ones.

* Convert IDE device drivers to use ide_device_{get,put}().

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/ide.h b/include/linux/ide.h
index 776c574c964..3eccac0a2a3 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -532,12 +532,16 @@ struct ide_dma_ops {
         void    (*dma_timeout)(struct ide_drive_s *);
 };
 
+struct ide_host;
+
 typedef struct hwif_s {
         struct hwif_s *next;            /* for linked-list in ide_hwgroup_t */
         struct hwif_s *mate;            /* other hwif from same PCI chip */
         struct hwgroup_s *hwgroup;      /* actually (ide_hwgroup_t *) */
         struct proc_dir_entry *proc;    /* /proc/ide/ directory entry */
 
+        struct ide_host *host;
+
         char name[6];                   /* name of interface, eg. "ide0" */
 
         struct ide_io_ports     io_ports;
@@ -876,6 +880,9 @@ struct ide_driver_s {
 
 #define to_ide_driver(drv) container_of(drv, ide_driver_t, gen_driver)
 
+int ide_device_get(ide_drive_t *);
+void ide_device_put(ide_drive_t *);
+
 int generic_ide_ioctl(ide_drive_t *, struct file *, struct block_device *, unsigned, unsigned long);
 
 extern int ide_vlb_clk;