linux-kernel - [PATCH 4.19 55/96] serial: sh-sci: Fix HSCIF RX sampling point adjustment

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Message-Id: <20190424170923.481759417@linuxfoundation.org>
Date:   Wed, 24 Apr 2019 19:10:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Ulrich Hecht <uli+renesas@...nd.eu>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Dirk Behme <dirk.behme@...bosch.com>,
        Simon Horman <horms+renesas@...ge.net.au>
Subject: [PATCH 4.19 55/96] serial: sh-sci: Fix HSCIF RX sampling point adjustment

From: Geert Uytterhoeven <geert+renesas@...der.be>

commit 6b87784b53592a90d21576be8eff688b56d93cce upstream.

The calculation of the sampling point has min() and max() exchanged.
Fix this by using the clamp() helper instead.

Fixes: 63ba1e00f178a448 ("serial: sh-sci: Support for HSCIF RX sampling point adjustment")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Reviewed-by: Ulrich Hecht <uli+renesas@...nd.eu>
Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Acked-by: Dirk Behme <dirk.behme@...bosch.com>
Cc: stable <stable@...r.kernel.org>
Reviewed-by: Simon Horman <horms+renesas@...ge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/sh-sci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2504,7 +2504,7 @@ done:
 				 * last stop bit; we can increase the error
 				 * margin by shifting the sampling point.
 				 */
-				int shift = min(-8, max(7, deviation / 2));
+				int shift = clamp(deviation / 2, -8, 7);
 
 				hssrr |= (shift << HSCIF_SRHP_SHIFT) &
 					 HSCIF_SRHP_MASK;