driver core: Add flag to autoremove device link on supplier unbind

Add a flag to autoremove the device links on supplier driver
unbind. This obviates the need to explicitly delete the link
in the remove path.
We remove these links only when the supplier's link to its
consumers has gone to DL_STATE_SUPPLIER_UNBIND state.

Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Suggested-by: Lukas Wunner <lukas@wunner.de>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 10 insertions, 0 deletions

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);
         }