[PATCH 4.9 40/83] tty: serial: msm_serial: Fix XON/XOFF

From: Greg Kroah-Hartman
Date: Sun Jun 09 2019 - 12:57:24 EST


From: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@xxxxxxxxxx>

commit 61c0e37950b88bad590056286c1d766b1f167f4e upstream.

When the tty layer requests the uart to throttle, the current code
executing in msm_serial will trigger "Bad mode in Error Handler" and
generate an invalid stack frame in pstore before rebooting (that is if
pstore is indeed configured: otherwise the user shall just notice a
reboot with no further information dumped to the console).

This patch replaces the PIO byte accessor with the word accessor
already used in PIO mode.

Fixes: 68252424a7c7 ("tty: serial: msm: Support big-endian CPUs")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@xxxxxxxxxx>
Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/tty/serial/msm_serial.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -868,6 +868,7 @@ static void msm_handle_tx(struct uart_po
struct circ_buf *xmit = &msm_port->uart.state->xmit;
struct msm_dma *dma = &msm_port->tx_dma;
unsigned int pio_count, dma_count, dma_min;
+ char buf[4] = { 0 };
void __iomem *tf;
int err = 0;

@@ -877,10 +878,12 @@ static void msm_handle_tx(struct uart_po
else
tf = port->membase + UART_TF;

+ buf[0] = port->x_char;
+
if (msm_port->is_uartdm)
msm_reset_dm_count(port, 1);

- iowrite8_rep(tf, &port->x_char, 1);
+ iowrite32_rep(tf, buf, 1);
port->icount.tx++;
port->x_char = 0;
return;