GB_UART_FIRMWARE_CREDITS
if (gb_tty->credits > GB_UART_FIRMWARE_CREDITS) {
if (gb_tty->credits == GB_UART_FIRMWARE_CREDITS)
if (gb_tty->credits == GB_UART_FIRMWARE_CREDITS)
if (gb_tty->credits < GB_UART_FIRMWARE_CREDITS)
chars += GB_UART_FIRMWARE_CREDITS - gb_tty->credits;
if (gb_tty->credits == GB_UART_FIRMWARE_CREDITS)
gb_tty->credits = GB_UART_FIRMWARE_CREDITS;