Commit ef7f6c70 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
Browse files

USB: more autosuspend timer stuff 



This patch (as879) ties up some loose ends from an earlier patch.
These are things I didn't think to include at the time but which
clearly belonged there.

	If an autosuspend fails because driver activity races with
	the autosuspend call, restart the autosuspend timer.

	When a device is resumed by an external request, it counts
	as device activity and should update the last_busy time so
	that the next autoresume won't occur immediately.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 4fe5354f

drivers/usb/core/driver.c

+14 −4
Original line number Diff line number Diff line
@@ -983,7 +983,10 @@ static int autosuspend_check(struct usb_device *udev) 


#else



#define autosuspend_check(udev)		0

static inline int autosuspend_check(struct usb_device *udev)

{

	return 0;

}



#endif	/* CONFIG_USB_SUSPEND */
@@ -1041,7 +1044,6 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) 
		if (status < 0)

			goto done;

	}

	cancel_delayed_work(&udev->autosuspend);



	/* Suspend all the interfaces and then udev itself */

	if (udev->actconfig) {
@@ -1062,9 +1064,16 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) 
			usb_resume_interface(intf);

		}



		/* Try another autosuspend when the interfaces aren't busy */

		if (udev->auto_pm)

			autosuspend_check(udev);



	/* If the suspend succeeded, propagate it up the tree */

	} else if (parent)

	} else {

		cancel_delayed_work(&udev->autosuspend);

		if (parent)

			usb_autosuspend_device(parent);

	}



 done:

	// dev_dbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status);
@@ -1475,6 +1484,7 @@ int usb_external_resume_device(struct usb_device *udev) 
	usb_pm_lock(udev);

	udev->auto_pm = 0;

	status = usb_resume_both(udev);

	udev->last_busy = jiffies;

	usb_pm_unlock(udev);



	/* Now that the device is awake, we can start trying to autosuspend

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