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serial: 8250: Fix TX interrupt handling condition

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Interrupt handler checked THRE bit (transmitter holding register
empty) in LSR to detect if TX fifo is empty.
In case when there is only receive interrupts the TX handling
got called because THRE bit in LSR is set when there is no
transmission (FIFO empty). TX handling caused TX stop, which in
RS-485 half-duplex mode actually resets receiver FIFO. This is not
desired during reception because of possible data loss.

The fix is to check if THRI is set in IER in addition of the TX
fifo status. THRI in IER is set when TX is started and cleared
when TX is stopped.
This ensures that TX handling is only called when there is really
transmission on going and an interrupt for THRE and not when there
are only RX interrupts.

Signed-off-by: Kimmo Rautkoski <ext-kimmo.rautkoski@vaisala.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rautkoski Kimmo EXT 2019-05-24 09:19:22 +00:00 committed by Greg Kroah-Hartman
parent 707aeea13a
commit db1b5bc047
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/serial/8250/8250_port.c
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@ -1875,7 +1875,8 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
status = serial8250_rx_chars(up, status);
}
serial8250_modem_status(up);
if ((!up->dma || up->dma->tx_err) && (status & UART_LSR_THRE))
if ((!up->dma || up->dma->tx_err) && (status & UART_LSR_THRE) &&
(up->ier & UART_IER_THRI))
serial8250_tx_chars(up);
uart_unlock_and_check_sysrq(port, flags);