On Tue, Feb 28, 2017 at 5:17 AM, Heiko Stuebner <heiko@xxxxxxxxx> wrote:
> clk_round_rate returns a signed long and may possibly return errors
> in it, for example if there is no possible rate.
>
> Till now dw8250_set_termios ignored any error, the signednes and would
> just use the value as input to clk_set_rate. This of course falls apart
> if there is an actual error, so check for errors and only try to set
> a rate if the value is actually valid.
>
FWIW:
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
> ---
> drivers/tty/serial/8250/8250_dw.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
> index 6ee55a2d47bb..223ac234ddb2 100644
> --- a/drivers/tty/serial/8250/8250_dw.c
> +++ b/drivers/tty/serial/8250/8250_dw.c
> @@ -257,7 +257,7 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
> {
> unsigned int baud = tty_termios_baud_rate(termios);
> struct dw8250_data *d = p->private_data;
> - unsigned int rate;
> + long rate;
> int ret;
>
> if (IS_ERR(d->clk) || !old)
> @@ -265,7 +265,10 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
>
> clk_disable_unprepare(d->clk);
> rate = clk_round_rate(d->clk, baud * 16);
> - ret = clk_set_rate(d->clk, rate);
> + if (rate < 0)
> + ret = rate;
> + else
> + ret = clk_set_rate(d->clk, rate);
> clk_prepare_enable(d->clk);
>
> if (!ret)
> --
> 2.11.0
>
--
With Best Regards,
Andy Shevchenko
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