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usb: cdc-acm: Decrement tty port's refcount if probe() fail
The cdc-acm driver does not have a refcount of itself, but uses a tty_port's refcount. That is, if the refcount of tty_port is '0', we can clean up the cdc-acm driver by calling the .destruct() callback function of struct tty_port_operations. The problem is the destruct() callback function is not called if the probe() fails, because tty_port's refcount is not zero. So, add tty_port_put() when probe() fails. Signed-off-by: Jaejoong Kim <[email protected]> Acked-by: Oliver Neukum <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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