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Regarding to: https://github.com/tanzilli/ariag25-linux-2.6.39/blob/ariag25/drivers/tty/serial/8250.c#L1584 https://github.com/tanzilli/ariag25-linux-2.6.39/blob/ariag25/drivers/tty/serial/8250.c#L1913 When UART_LSR_THRE bit is set, then we ready to transmit more. Current u16550_putc loops while UART_LSR_THRE bit is set. This logic have to be inverted. Signed-off-by: Anton D. Kachalov <mouse@yandex-team.ru>