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Subject: [PATCH v3 03/21] Staging: gdm724x: use match_string() helper
To:     <linux-kernel@vger.kernel.org>
References: <1527765086-19873-1-git-send-email-xieyisheng1@huawei.com>
 <1527765086-19873-4-git-send-email-xieyisheng1@huawei.com>
CC:     <andy.shevchenko@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Quytelda Kahja <quytelda@tamalin.org>,
        <devel@driverdev.osuosl.org>,
        Kefeng Wang <wangkefeng.wang@huawei.com>
From:   Yisheng Xie <xieyisheng1@huawei.com>
Message-ID: <643c3ad1-55c0-4ad6-7305-4938b1280be6@huawei.com>
Date:   Wed, 6 Jun 2018 10:21:11 +0800
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match_string() returns the index of an array for a matching string,
which can be used instead of open coded variant.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Quytelda Kahja <quytelda@tamalin.org>
Cc: devel@driverdev.osuosl.org
Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
---
v3:
 - no need to check input tty's index - per Greg
v2:
 - const DRIVER_STRING instead  - per Andy

 drivers/staging/gdm724x/gdm_tty.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
index 3cdebb8..29ac6b5 100644
--- a/drivers/staging/gdm724x/gdm_tty.c
+++ b/drivers/staging/gdm724x/gdm_tty.c
@@ -43,7 +43,7 @@
 static struct gdm *gdm_table[TTY_MAX_COUNT][GDM_TTY_MINOR];
 static DEFINE_MUTEX(gdm_table_lock);

-static char *DRIVER_STRING[TTY_MAX_COUNT] = {"GCTATC", "GCTDM"};
+static const char *DRIVER_STRING[TTY_MAX_COUNT] = {"GCTATC", "GCTDM"};
 static char *DEVICE_STRING[TTY_MAX_COUNT] = {"GCT-ATC", "GCT-DM"};

 static void gdm_port_destruct(struct tty_port *port)
@@ -65,22 +65,14 @@ static int gdm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 {
 	struct gdm *gdm = NULL;
 	int ret;
-	int i;
-	int j;
-
-	j = GDM_TTY_MINOR;
-	for (i = 0; i < TTY_MAX_COUNT; i++) {
-		if (!strcmp(tty->driver->driver_name, DRIVER_STRING[i])) {
-			j = tty->index;
-			break;
-		}
-	}

-	if (j == GDM_TTY_MINOR)
+	ret = match_string(DRIVER_STRING, TTY_MAX_COUNT,
+			   tty->driver->driver_name);
+	if (ret < 0)
 		return -ENODEV;

 	mutex_lock(&gdm_table_lock);
-	gdm = gdm_table[i][j];
+	gdm = gdm_table[ret][tty->index];
 	if (!gdm) {
 		mutex_unlock(&gdm_table_lock);
 		return -ENODEV;
-- 
1.7.12.4