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serial: 8250_dw: Simplify the ref clock rate setting procedure 

Really instead of twice checking the clk_round_rate() return value
we could do it once, and if it isn't error the clock rate can be changed.
By doing so we decrease a number of ret-value tests and remove a weird
goto-based construction implemented in the dw8250_set_termios() method.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>

Link: https://lore.kernel.org/r/20200723003357.26897-3-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Serge Semin 2020-07-23 03:33:55 +03:00 committed by Greg Kroah-Hartman
parent 868f3ee6e4
commit 442fdef1b9
1 changed files with 4 additions and 11 deletions
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15
drivers/tty/serial/8250/8250_dw.c
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@ -282,20 +282,13 @@ 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);
if (rate < 0)
ret = rate;
else if (rate == 0)
ret = -ENOENT;
else
if (rate > 0) {
ret = clk_set_rate(d->clk, rate);
if (!ret)
p->uartclk = rate;
}
clk_prepare_enable(d->clk);
if (ret)
goto out;
p->uartclk = rate;
out:
p->status &= ~UPSTAT_AUTOCTS;
if (termios->c_cflag & CRTSCTS)
p->status |= UPSTAT_AUTOCTS;