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USB: move decision to ignore FREEZE events 

This patch (as987) changes the way FREEZE and PRETHAW suspend events
are handled in usbcore.  The decision about whether or not to ignore
them for non-root devices is pushed down into the USB-device driver,
instead of being made in the core code.

This is appropriate, since devices exported to a virtualized guest or
over a network may indeed need to handle these types of suspend, even
though normal devices don't.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2007-09-10 11:31:43 -04:00 committed by Greg Kroah-Hartman
parent 7477120e34
commit 5ad4f71e2f
2 changed files with 6 additions and 8 deletions
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9
drivers/usb/core/driver.c
View File

@ -1088,15 +1088,8 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
break;
}
}
if (status == 0) {
/* Non-root devices don't need to do anything for FREEZE
* or PRETHAW. */
if (udev->parent && (msg.event == PM_EVENT_FREEZE ||
msg.event == PM_EVENT_PRETHAW))
goto done;
if (status == 0)
status = usb_suspend_device(udev, msg);
}
/* If the suspend failed, resume interfaces that did get suspended */
if (status != 0) {

5
drivers/usb/core/generic.c
View File

@ -206,8 +206,13 @@ static int generic_suspend(struct usb_device *udev, pm_message_t msg)
*/
if (!udev->parent)
rc = hcd_bus_suspend(udev);
/* 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);
return rc;
}