From: Jiri Slaby jslaby@suse.cz
[ Upstream commit d9c128117da41cf4cb0e80ae565b5d3ac79dffac ]
The "stop TX" path in altera_uart_tx_chars() is open-coded, so: * use uart_circ_empty() to check if the buffer is empty, and * when true, call altera_uart_stop_tx().
Cc: Tobias Klauser tklauser@distanz.ch Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Acked-by: Tobias Klauser tklauser@distanz.ch Signed-off-by: Jiri Slaby jslaby@suse.cz Link: https://lore.kernel.org/r/20220920052049.20507-3-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Stable-dep-of: 1307c5d33cce ("serial: altera_uart: fix locking in polling mode") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/tty/serial/altera_uart.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c index 0e487ce091ac..508a3c2b7781 100644 --- a/drivers/tty/serial/altera_uart.c +++ b/drivers/tty/serial/altera_uart.c @@ -274,10 +274,8 @@ static void altera_uart_tx_chars(struct altera_uart *pp) if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port);
- if (xmit->head == xmit->tail) { - pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; - altera_uart_update_ctrl_reg(pp); - } + if (uart_circ_empty(xmit)) + altera_uart_stop_tx(port); }
static irqreturn_t altera_uart_interrupt(int irq, void *data)