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Diffstat (limited to 'drivers/thunderbolt/xdomain.c')
-rw-r--r--drivers/thunderbolt/xdomain.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
index 8abb4e843085..db8bece63327 100644
--- a/drivers/thunderbolt/xdomain.c
+++ b/drivers/thunderbolt/xdomain.c
@@ -13,6 +13,7 @@
#include <linux/device.h>
#include <linux/kmod.h>
#include <linux/module.h>
+#include <linux/pm_runtime.h>
#include <linux/utsname.h>
#include <linux/uuid.h>
#include <linux/workqueue.h>
@@ -1129,6 +1130,14 @@ struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent,
xd->dev.groups = xdomain_attr_groups;
dev_set_name(&xd->dev, "%u-%llx", tb->index, route);
+ /*
+ * This keeps the DMA powered on as long as we have active
+ * connection to another host.
+ */
+ pm_runtime_set_active(&xd->dev);
+ pm_runtime_get_noresume(&xd->dev);
+ pm_runtime_enable(&xd->dev);
+
return xd;
err_free_local_uuid:
@@ -1174,6 +1183,15 @@ void tb_xdomain_remove(struct tb_xdomain *xd)
device_for_each_child_reverse(&xd->dev, xd, unregister_service);
+ /*
+ * Undo runtime PM here explicitly because it is possible that
+ * the XDomain was never added to the bus and thus device_del()
+ * is not called for it (device_del() would handle this otherwise).
+ */
+ pm_runtime_disable(&xd->dev);
+ pm_runtime_put_noidle(&xd->dev);
+ pm_runtime_set_suspended(&xd->dev);
+
if (!device_is_registered(&xd->dev))
put_device(&xd->dev);
else