On Wed, Oct 04, 2023 at 11:57:22AM +0200, Paul Geurts wrote: > When using the serial port as RS485 port, the tx statemachine is used to > control the RTS pin to drive the RS485 transceiver TX_EN pin. When the > TTY port is closed in the middle of a transmission (for instance during > userland application crash), imx_uart_shutdown disables the interface > and disables the Transmission Complete interrupt. afer that, > imx_uart_stop_tx bails on an incomplete transmission, to be retriggered > by the TC interrupt. This interrupt is disabled and therefore the tx > statemachine never transitions out of SEND. The statemachine is in > deadlock now, and the TX_EN remains low, making the interface useless. > > imx_uart_stop_tx now checks for incomplete transmission AND whether TC > interrupts are enabled before bailing to be retriggered. This makes sure > the state machine handling is reached, and is properly set to > WAIT_AFTER_SEND. > > Signed-off-by: Paul Geurts <paul_geurts@xxxxxxx> > --- > drivers/tty/serial/imx.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) What commit id does this fix? thanks, greg k-h
