USB: Enhance usage of pm_message_t

This patch (as1177) modifies the USB core suspend and resume
routines.  The resume functions now will take a pm_message_t argument,
so they will know what sort of resume is occurring.  The new argument
is also passed to the port suspend/resume and bus suspend/resume
routines (although they don't use it for anything but debugging).

In addition, special pm_message_t values are used for user-initiated,
device-initiated (i.e., remote wakeup), and automatic suspend/resume.
By testing these values, drivers can tell whether or not a particular
suspend was an autosuspend.  Unfortunately, they can't do the same for
resumes -- not until the pm_message_t argument is also passed to the
drivers' resume methods.  That will require a bigger change.

IMO, the whole Power Management framework should have been set up this
way in the first place.

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

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/usb/core/generic.c b/drivers/usb/core/generic.c
index 7e912f21fd36..30ecac3af15a 100644
--- a/drivers/usb/core/generic.c
+++ b/drivers/usb/core/generic.c
@@ -200,18 +200,18 @@ static int generic_suspend(struct usb_device *udev, pm_message_t msg)
 	 * interfaces manually by doing a bus (or "global") suspend.
 	 */
 	if (!udev->parent)
-		rc = hcd_bus_suspend(udev);
+		rc = hcd_bus_suspend(udev, msg);
 
 	/* Non-root devices don't need to do anything for FREEZE or PRETHAW */
 	else if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_PRETHAW)
 		rc = 0;
 	else
-		rc = usb_port_suspend(udev);
+		rc = usb_port_suspend(udev, msg);
 
 	return rc;
 }
 
-static int generic_resume(struct usb_device *udev)
+static int generic_resume(struct usb_device *udev, pm_message_t msg)
 {
 	int rc;
 
@@ -221,9 +221,9 @@ static int generic_resume(struct usb_device *udev)
 	 * interfaces manually by doing a bus (or "global") resume.
 	 */
 	if (!udev->parent)
-		rc = hcd_bus_resume(udev);
+		rc = hcd_bus_resume(udev, msg);
 	else
-		rc = usb_port_resume(udev);
+		rc = usb_port_resume(udev, msg);
 	return rc;
 }