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* [PATCH v3] serial: 8250_fsl: Fix TX interrupt handling condition
@ 2020-09-28 14:41 Andrij Abyzov
  0 siblings, 0 replies; only message in thread
From: Andrij Abyzov @ 2020-09-28 14:41 UTC (permalink / raw)
  To: linux-serial; +Cc: gregkh, Andrij Abyzov

This is the port of the commit db1b5bc047b3 ("serial: 8250: Fix TX
interrupt handling condition") to the 8250_fsl irq handling logic.

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: Andrij Abyzov <>
Changes in v3:
    - Added change history
Changes in v2:
    - Rewritten commit description

 drivers/tty/serial/8250/8250_fsl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_fsl.c b/drivers/tty/serial/8250/8250_fsl.c
index 0d0c80905c58..ceac6cfce4c7 100644
--- a/drivers/tty/serial/8250/8250_fsl.c
+++ b/drivers/tty/serial/8250/8250_fsl.c
@@ -71,7 +71,7 @@ int fsl8250_handle_irq(struct uart_port *port)
-	if (lsr & UART_LSR_THRE)
+	if ((lsr & UART_LSR_THRE) && (up->ier & UART_IER_THRI))
 	up->lsr_saved_flags = orig_lsr;

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2020-09-28 14:41 [PATCH v3] serial: 8250_fsl: Fix TX interrupt handling condition Andrij Abyzov

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