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, 0 insertions, 3 deletions

diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 76db76fdb4ec..c20c03aaf012 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -286,9 +286,6 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
                 return -EINVAL;
         if (!(dev = urb->dev) || dev->state < USB_STATE_DEFAULT)
                 return -ENODEV;
-        if (dev->bus->controller->power.power_state.event != PM_EVENT_ON
-                        || dev->state == USB_STATE_SUSPENDED)
-                return -EHOSTUNREACH;
 
         /* For now, get the endpoint from the pipe.  Eventually drivers
          * will be required to set urb->ep directly and we will eliminate