linux-kernel - [PATCH v2 12/21] drm: i2c: ch7006: use match

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Date:   Thu, 31 May 2018 19:11:17 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <andy.shevchenko@...il.com>, Yisheng Xie <xieyisheng1@...wei.com>,
        "David Airlie" <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        "Arvind Yadav" <arvind.yadav.cs@...il.com>,
        <dri-devel@...ts.freedesktop.org>
Subject: [PATCH v2 12/21] drm: i2c: ch7006: use match_string() helper

match_string() returns the index of an array for a matching string,
which can be used instead of open coded variant.

Cc: David Airlie <airlied@...ux.ie>
Cc: Yisheng Xie <xieyisheng1@...wei.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Arvind Yadav <arvind.yadav.cs@...il.com>
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
---
v2:
 - handle err case before normal case.

 drivers/gpu/drm/i2c/ch7006_drv.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i2c/ch7006_drv.c b/drivers/gpu/drm/i2c/ch7006_drv.c
index 544a8a2..9eefdfe 100644
--- a/drivers/gpu/drm/i2c/ch7006_drv.c
+++ b/drivers/gpu/drm/i2c/ch7006_drv.c
@@ -464,16 +464,13 @@ static int ch7006_encoder_init(struct i2c_client *client,
 	priv->chip_version = ch7006_read(client, CH7006_VERSION_ID);
 
 	if (ch7006_tv_norm) {
-		for (i = 0; i < NUM_TV_NORMS; i++) {
-			if (!strcmp(ch7006_tv_norm_names[i], ch7006_tv_norm)) {
-				priv->norm = i;
-				break;
-			}
-		}
-
-		if (i == NUM_TV_NORMS)
+		i = match_string(ch7006_tv_norm_names,
+				 NUM_TV_NORMS, ch7006_tv_norm);
+		if (i < 0)
 			ch7006_err(client, "Invalid TV norm setting \"%s\".\n",
 				   ch7006_tv_norm);
+		else
+			priv->norm = i;
 	}
 
 	if (ch7006_scale >= 0 && ch7006_scale <= 2)
-- 
1.7.12.4