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usbip: usbip_detach: fix to check for invalid ports
usbip detach doesn't check for invalid ports and ports that are already detached. It attempts to remove state file(s) without validating the port and sends detach request to the driver for ports that are already detached. Add check for invalid ports (port > maxports) and ports that are already detached (status == VDEV_ST_NULL). Don't remove state files and don't send detach request for invalid ports and ports that are already detached. Add error and information messages that make sense. Signed-off-by: Shuah Khan (Samsung OSG) <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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