diff options
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 92fb2e39134e..30e0aaf52adc 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -1783,9 +1783,11 @@ void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr) EXPORT_SYMBOL_GPL(serial8250_read_char); /* - * serial8250_rx_chars: processes according to the passed in LSR - * value, and returns the remaining LSR bits not handled - * by this Rx routine. + * serial8250_rx_chars - Read characters. The first LSR value must be passed in. + * + * Returns LSR bits. The caller should rely only on non-Rx related LSR bits + * (such as THRE) because the LSR value might come from an already consumed + * character. */ unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr) { |