On 2016/8/22 19:08, Andy Shevchenko wrote:
> On Fri, 2016-07-15 at 19:01 +0800, Kefeng Wang wrote:
>> We can safely use dw8250_set_termios() as the default set_termios
>> callback instead of serial8250_do_set_termios(), so do it.
>
> So, current set_termios() relies on clock to be defined or be an error
> pointer. I'm not sure that it handles NULL properly.
>
> So, the question is does set_termios() handle all possible cases? If no,
> do we guarantee that the case it doesn't handle never happened?
>
> Answer to this question and amend either the patch or improve commit
> message.
>
If clk do be NUL, uartclk will be set wrong value, zero, will judge this case
in dw8250_set_termios, then make it as default callback.
>>
>> Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
>> ---
>> drivers/tty/serial/8250/8250_dw.c | 3 +--
>> 1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/tty/serial/8250/8250_dw.c
>> b/drivers/tty/serial/8250/8250_dw.c
>> index e199696..65f3da7 100644
>> --- a/drivers/tty/serial/8250/8250_dw.c
>> +++ b/drivers/tty/serial/8250/8250_dw.c
>> @@ -301,7 +301,6 @@ static void dw8250_quirks(struct uart_port *p,
>> struct dw8250_data *data)
>> p->iotype = UPIO_MEM32;
>> p->regshift = 2;
>> p->serial_in = dw8250_serial_in32;
>> - p->set_termios = dw8250_set_termios;
>> /* So far none of there implement the Busy
>> Functionality */
>> data->uart_16550_compatible = true;
>> }
>> @@ -309,7 +308,6 @@ static void dw8250_quirks(struct uart_port *p,
>> struct dw8250_data *data)
>> /* Platforms with iDMA */
>> if (platform_get_resource_byname(to_platform_device(p->dev),
>> IORESOURCE_MEM,
>> "lpss_priv")) {
>> - p->set_termios = dw8250_set_termios;
>> data->dma.rx_param = p->dev->parent;
>> data->dma.tx_param = p->dev->parent;
>> data->dma.fn = dw8250_idma_filter;
>> @@ -386,6 +384,7 @@ static int dw8250_probe(struct platform_device
>> *pdev)
>> p->iotype = UPIO_MEM;
>> p->serial_in = dw8250_serial_in;
>> p->serial_out = dw8250_serial_out;
>> + p->set_termios = dw8250_set_termios;
>>
>> p->membase = devm_ioremap(&pdev->dev, regs->start,
>> resource_size(regs));
>> if (!p->membase)
>
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