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, 9 insertions, 3 deletions

diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 3d8e6dd0f41e..ca11a26746f1 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -158,23 +158,29 @@ static DEFINE_MUTEX(idefloppy_ref_mutex);
 #define ide_floppy_g(disk) \
         container_of((disk)->private_data, struct ide_floppy_obj, driver)
 
+static void idefloppy_cleanup_obj(struct kref *);
+
 static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
 {
         struct ide_floppy_obj *floppy = NULL;
 
         mutex_lock(&idefloppy_ref_mutex);
         floppy = ide_floppy_g(disk);
-        if (floppy)
+        if (floppy) {
                 kref_get(&floppy->kref);
+                if (ide_device_get(floppy->drive)) {
+                        kref_put(&floppy->kref, idefloppy_cleanup_obj);
+                        floppy = NULL;
+                }
+        }
         mutex_unlock(&idefloppy_ref_mutex);
         return floppy;
 }
 
-static void idefloppy_cleanup_obj(struct kref *);
-
 static void ide_floppy_put(struct ide_floppy_obj *floppy)
 {
         mutex_lock(&idefloppy_ref_mutex);
+        ide_device_put(floppy->drive);
         kref_put(&floppy->kref, idefloppy_cleanup_obj);
         mutex_unlock(&idefloppy_ref_mutex);
 }