MIPS: TXx9: Default machine_restart using watchdog reset

[linux-2.6-omap-h63xx.git] / drivers / ide / ide.c

diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 60f0ca66aa93735d68f27478888cf01132457d47..772451600e4d96064b57f8732a7579481ee2b3a1 100644 (file)
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -618,6 +618,53 @@ set_val:
 
 EXPORT_SYMBOL(generic_ide_ioctl);
 
+/**
+ * ide_device_get      -       get an additional reference to a ide_drive_t
+ * @drive:     device to get a reference to
+ *
+ * Gets a reference to the ide_drive_t and increments the use count of the
+ * underlying LLDD module.
+ */
+int ide_device_get(ide_drive_t *drive)
+{
+       struct device *host_dev;
+       struct module *module;
+
+       if (!get_device(&drive->gendev))
+               return -ENXIO;
+
+       host_dev = drive->hwif->host->dev[0];
+       module = host_dev ? host_dev->driver->owner : NULL;
+
+       if (module && !try_module_get(module)) {
+               put_device(&drive->gendev);
+               return -ENXIO;
+       }
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(ide_device_get);
+
+/**
+ * ide_device_put      -       release a reference to a ide_drive_t
+ * @drive:     device to release a reference on
+ *
+ * Release a reference to the ide_drive_t and decrements the use count of
+ * the underlying LLDD module.
+ */
+void ide_device_put(ide_drive_t *drive)
+{
+#ifdef CONFIG_MODULE_UNLOAD
+       struct device *host_dev = drive->hwif->host->dev[0];
+       struct module *module = host_dev ? host_dev->driver->owner : NULL;
+
+       if (module)
+               module_put(module);
+#endif
+       put_device(&drive->gendev);
+}
+EXPORT_SYMBOL_GPL(ide_device_put);
+
 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 {
        return 1;