AcoSail/kernel_optimize_test
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USB: move decision to ignore FREEZE events

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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;
}