USB: flush outstanding URBs when suspending

This patch (as989) makes usbcore flush all outstanding URBs for each
device as the device is suspended.  This will be true even when
CONFIG_USB_SUSPEND is not enabled.

In addition, an extra can_submit flag is added to the usb_device
structure.  That flag will be turned off whenever a suspend request
has been received for the device, even if the device isn't actually
suspended because CONFIG_USB_SUSPEND isn't set.

It's no longer necessary to check for the device state being equal to
USB_STATE_SUSPENDED during URB submission; that check can be replaced
by a check of the can_submit flag.  This also permits us to remove
some questionable references to the deprecated power.power_state field.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 8 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index bd08d51d7f4..691acf2223c 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1955,14 +1955,7 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
                 struct usb_device       *udev;
 
                 udev = hdev->children [port1-1];
-                if (udev && msg.event == PM_EVENT_SUSPEND &&
-#ifdef  CONFIG_USB_SUSPEND
-                                udev->state != USB_STATE_SUSPENDED
-#else
-                                udev->dev.power.power_state.event
-                                        == PM_EVENT_ON
-#endif
-                                ) {
+                if (udev && udev->can_submit) {
                         if (!hdev->auto_pm)
                                 dev_dbg(&intf->dev, "port %d nyet suspended\n",
                                                 port1);