Changeset 2fd26bb in mainline for uspace/lib/drv/generic/driver.c

Timestamp:

2017-10-08T20:17:59Z (8 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

d15797d

Parents:

82cbf8c6

Message:

Make it simpler to get parent function session repeatedly without having to cache it.

File:

• uspace/lib/drv/generic/driver.c (modified) (1 diff)

uspace/lib/drv/generic/driver.c

@@ -599 +599 @@
 }
 
-/** Create session with the parent function.
- *
- * The session will be automatically closed when @a dev is destroyed.
- *
- * @param dev Device
- *
- * @return New session or NULL if session could not be created
- *
- */
-async_sess_t *ddf_dev_parent_sess_create(ddf_dev_t *dev)
-{
-        assert(dev->parent_sess == NULL);
-        dev->parent_sess = devman_parent_device_connect(dev->handle,
-            IPC_FLAG_BLOCKING);
-
-        return dev->parent_sess;
-}
-
 /** Return existing session with the parent function.
  *
  * @param dev   Device
- * @return      Existing session or NULL if there is no session
+ * @return      Session with parent function or NULL upon failure
  */
 async_sess_t *ddf_dev_parent_sess_get(ddf_dev_t *dev)
 {
+        if (dev->parent_sess == NULL) {
+                dev->parent_sess = devman_parent_device_connect(dev->handle,
+                    IPC_FLAG_BLOCKING);
+        }
+
         return dev->parent_sess;
 }