On Mon 20 May 11:38 PDT 2019, Jorge Ramirez-Ortiz wrote:
> 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>
You missed Stephen's
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Regards,
Bjorn
> ---
> drivers/tty/serial/msm_serial.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
> index 109096033bb1..23833ad952ba 100644
> --- a/drivers/tty/serial/msm_serial.c
> +++ b/drivers/tty/serial/msm_serial.c
> @@ -860,6 +860,7 @@ static void msm_handle_tx(struct uart_port *port)
> 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;
>
> @@ -869,10 +870,12 @@ static void msm_handle_tx(struct uart_port *port)
> 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;
> --
> 2.21.0
>
