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-rw-r--r--drivers/usb/core/hub.c46
1 files changed, 44 insertions, 2 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 8eb4da332f56..94789be54ca3 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -644,6 +644,48 @@ static void hub_stop(struct usb_hub *hub)
#ifdef CONFIG_PM
+/* Try to identify which devices need USB-PERSIST handling */
+static int persistent_device(struct usb_device *udev)
+{
+ int i;
+ int retval;
+ struct usb_host_config *actconfig;
+
+ /* Explicitly not marked persistent? */
+ if (!udev->persist_enabled)
+ return 0;
+
+ /* No active config? */
+ actconfig = udev->actconfig;
+ if (!actconfig)
+ return 0;
+
+ /* FIXME! We should check whether it's open here or not! */
+
+ /*
+ * Check that all the interface drivers have a
+ * 'reset_resume' entrypoint
+ */
+ retval = 0;
+ for (i = 0; i < actconfig->desc.bNumInterfaces; i++) {
+ struct usb_interface *intf;
+ struct usb_driver *driver;
+
+ intf = actconfig->interface[i];
+ if (!intf->dev.driver)
+ continue;
+ driver = to_usb_driver(intf->dev.driver);
+ if (!driver->reset_resume)
+ return 0;
+ /*
+ * We have at least one driver, and that one
+ * has a reset_resume method.
+ */
+ retval = 1;
+ }
+ return retval;
+}
+
static void hub_restart(struct usb_hub *hub, int type)
{
struct usb_device *hdev = hub->hdev;
@@ -689,8 +731,8 @@ static void hub_restart(struct usb_hub *hub, int type)
* turn off the various status changes to prevent
* khubd from disconnecting it later.
*/
- if (udev->persist_enabled && status == 0 &&
- !(portstatus & USB_PORT_STAT_ENABLE)) {
+ if (status == 0 && !(portstatus & USB_PORT_STAT_ENABLE) &&
+ persistent_device(udev)) {
if (portchange & USB_PORT_STAT_C_ENABLE)
clear_port_feature(hub->hdev, port1,
USB_PORT_FEAT_C_ENABLE);