From: Lino Sanfilippo LinoSanfilippo@gmx.de
commit 0e4deb56b0c625efdb70c94f150429e2f2a16fa1 upstream.
The current timeout for draining the tx fifo in RS485 mode is calculated by multiplying the time it takes to transmit one character (with the given baud rate) with the maximal number of characters in the tx queue.
This timeout is too short for two reasons: First when calculating the time to transmit one character integer division is used which may round down the result in case of a remainder of the division.
Fix this by rounding up the division result.
Second the hardware may need additional time (e.g for first putting the characters from the fifo into the shift register) before the characters are actually put onto the wire.
To be on the safe side double the current maximum number of iterations that are used to wait for the queue draining.
Fixes: 8d479237727c ("serial: amba-pl011: add RS485 support") Cc: stable@vger.kernel.org Signed-off-by: Lino Sanfilippo LinoSanfilippo@gmx.de Link: https://lore.kernel.org/r/20220408233503.7251-1-LinoSanfilippo@gmx.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/amba-pl011.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
--- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -1288,13 +1288,18 @@ static inline bool pl011_dma_rx_running(
static void pl011_rs485_tx_stop(struct uart_amba_port *uap) { + /* + * To be on the safe side only time out after twice as many iterations + * as fifo size. + */ + const int MAX_TX_DRAIN_ITERS = uap->port.fifosize * 2; struct uart_port *port = &uap->port; int i = 0; u32 cr;
/* Wait until hardware tx queue is empty */ while (!pl011_tx_empty(port)) { - if (i == port->fifosize) { + if (i > MAX_TX_DRAIN_ITERS) { dev_warn(port->dev, "timeout while draining hardware tx queue\n"); break; @@ -2099,7 +2104,7 @@ pl011_set_termios(struct uart_port *port * with the given baud rate. We use this as the poll interval when we * wait for the tx queue to empty. */ - uap->rs485_tx_drain_interval = (bits * 1000 * 1000) / baud; + uap->rs485_tx_drain_interval = DIV_ROUND_UP(bits * 1000 * 1000, baud);
pl011_setup_status_masks(port, termios);