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Some MBIM devices send back-to-back USB_CDC_NOTIFY_RESPONSE_AVAILABLE notifications when sending a message over multiple fragments or when there are unsolicited messages available. Count up the number of USB_CDC_NOTIFY_RESPONSE_AVAILABLE notifications received and decrement the count and submit the urb for the next response each time userspace completes a read the response. Signed-off-by: Greg Suarez <gsuarez@smithmicro.com> Acked-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>