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USB: simplify hub_restart() logic

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This patch (as1081) straightens out the logic of the hub_restart()
routine.  Each port of the hub is scanned and the driver makes sure
that ports which are supposed to be disabled really _are_ disabled.
Any ports with a significant change in status are flagged in
hub->change_bits, so that khubd can focus on them without the need to
scan all the ports a second time -- which means the hub->activating
flag is no longer needed.

Also, it is now recognized explicitly that the only reason for
resuming a port which was not suspended is to carry out a reset-resume
operation, which happens only in a non-CONFIG_USB_SUSPEND setting.

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
2008-04-28 11:06:42 -04:00
committed by Greg Kroah-Hartman
parent 9e5eace734
commit 6ee0b270c7
2 changed files with 55 additions and 68 deletions
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7
drivers/usb/core/driver.c
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@@ -805,8 +805,6 @@ static int usb_resume_device(struct usb_device *udev)
if (udev->state == USB_STATE_NOTATTACHED)
goto done;
if (udev->state != USB_STATE_SUSPENDED && !udev->reset_resume)
goto done;
/* Can't resume it if it doesn't have a driver. */
if (udev->dev.driver == NULL) {
@@ -1173,11 +1171,8 @@ static int usb_resume_both(struct usb_device *udev)
* then we're stuck. */
status = usb_resume_device(udev);
}
} else {
/* Needed for reset-resume */
} else if (udev->reset_resume)
status = usb_resume_device(udev);
}
if (status == 0 && udev->actconfig) {
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {