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From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jslaby@suse.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Serge Semin <Sergey.Semin@baikalelectronics.ru>,
	Serge Semin <fancer.lancer@gmail.com>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	Maxime Ripard <mripard@kernel.org>, Will Deacon <will@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-serial@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v9 2/4] serial: 8250_dw: Simplify the ref clock rate setting procedure
Date: Thu, 23 Jul 2020 03:33:55 +0300
Message-ID: <20200723003357.26897-3-Sergey.Semin@baikalelectronics.ru> (raw)
In-Reply-To: <20200723003357.26897-1-Sergey.Semin@baikalelectronics.ru>

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>

---

Changelog v3:
- This is a new patch.
---
 drivers/tty/serial/8250/8250_dw.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index aab3cccc6789..12866083731d 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -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;
-- 
2.26.2


  parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-23  0:33 [PATCH v9 0/4] serial: 8250_dw: Fix ref clock usage Serge Semin
2020-07-23  0:33 ` [PATCH v9 1/4] serial: 8250: Add 8250 port clock update method Serge Semin
2020-07-23  0:33 ` Serge Semin [this message]
2020-07-23  0:33 ` [PATCH v9 3/4] serial: 8250_dw: Pass the same rate to the clk round and set rate methods Serge Semin
2020-07-23  0:33 ` [PATCH v9 4/4] serial: 8250_dw: Fix common clocks usage race condition Serge Semin

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