On 5/20/19 20:50, Bjorn Andersson wrote:
> 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>
argh sorry Stephen. can the maintainer add it when it gets merged or
shall I post V3?
>
> 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
>>
>
