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path: root/drivers/ide/ide.c
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Diffstat (limited to 'drivers/ide/ide.c')
-rw-r--r--drivers/ide/ide.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 60f0ca66aa93..772451600e4d 100644
--- 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;