summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--Documentation/driver-api/device_link.rst4
-rw-r--r--drivers/base/core.c10
-rw-r--r--include/linux/device.h2
3 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/driver-api/device_link.rst b/Documentation/driver-api/device_link.rst
index a005b904a264..d6763272e747 100644
--- a/Documentation/driver-api/device_link.rst
+++ b/Documentation/driver-api/device_link.rst
@@ -86,6 +86,10 @@ automatically purged when the consumer fails to probe or later unbinds.
This obviates the need to explicitly delete the link in the ``->remove``
callback or in the error path of the ``->probe`` callback.
+Similarly, when the device link is added from supplier's ``->probe`` callback,
+``DL_FLAG_AUTOREMOVE_SUPPLIER`` causes the device link to be automatically
+purged when the supplier fails to probe or later unbinds.
+
Limitations
===========
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 14c1e3151e08..e721218bf352 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -518,6 +518,16 @@ void device_links_driver_cleanup(struct device *dev)
WARN_ON(link->flags & DL_FLAG_AUTOREMOVE_CONSUMER);
WARN_ON(link->status != DL_STATE_SUPPLIER_UNBIND);
+
+ /*
+ * autoremove the links between this @dev and its consumer
+ * devices that are not active, i.e. where the link state
+ * has moved to DL_STATE_SUPPLIER_UNBIND.
+ */
+ if (link->status == DL_STATE_SUPPLIER_UNBIND &&
+ link->flags & DL_FLAG_AUTOREMOVE_SUPPLIER)
+ kref_put(&link->kref, __device_link_del);
+
WRITE_ONCE(link->status, DL_STATE_DORMANT);
}
diff --git a/include/linux/device.h b/include/linux/device.h
index 3929805cdd59..e80920452b49 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -787,11 +787,13 @@ enum device_link_state {
* AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
* PM_RUNTIME: If set, the runtime PM framework will use this link.
* RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
+ * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
*/
#define DL_FLAG_STATELESS BIT(0)
#define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
#define DL_FLAG_PM_RUNTIME BIT(2)
#define DL_FLAG_RPM_ACTIVE BIT(3)
+#define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
/**
* struct device_link - Device link representation.