linux-kernel - [PATCHv2] staging: most: replace multiple if..else with table lookup

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Message-ID: <20151228085627.GA6862@IND12F0122>
Date:	Mon, 28 Dec 2015 08:55:37 +0000
From:	"Gujulan Elango, Hari Prasath (H.)" <hgujulan@...teon.com>
To:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"christian.gromm@...rochip.com" <christian.gromm@...rochip.com>,
	"joe@...ches.com" <joe@...ches.com>,
	"andrey.shvetsov@....de" <andrey.shvetsov@....de>,
	"sudipm.mukherjee@...il.com" <sudipm.mukherjee@...il.com>,
	"adrianremonda@...il.com" <adrianremonda@...il.com>
CC:	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCHv2] staging: most: replace multiple if..else with table lookup

From: Hari Prasath Gujulan Elango <hgujulan@...teon.com>

Replace multiple if..else if..statements with simple table lookup in two
functions.

Signed-off-by: Hari Prasath Gujulan Elango <hgujulan@...teon.com>
---
 drivers/staging/most/mostcore/core.c | 41 +++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 17 deletions(-)

diff --git a/drivers/staging/most/mostcore/core.c b/drivers/staging/most/mostcore/core.c
index ed1ed25..fe6705a 100644
--- a/drivers/staging/most/mostcore/core.c
+++ b/drivers/staging/most/mostcore/core.c
@@ -82,6 +82,14 @@ struct most_inst_obj {
 	struct list_head list;
 };
 
+static const struct {
+	int most_ch_data_type;
+	char *name;
+} ch_data_type[] = { { MOST_CH_CONTROL, "control\n" },
+	{ MOST_CH_ASYNC, "async\n" },
+	{ MOST_CH_SYNC, "sync\n" },
+	{ MOST_CH_ISOC_AVP, "isoc_avp\n"} };
+
 #define to_inst_obj(d) container_of(d, struct most_inst_obj, kobj)
 
 /**
@@ -414,14 +422,12 @@ static ssize_t show_set_datatype(struct most_c_obj *c,
 				 struct most_c_attr *attr,
 				 char *buf)
 {
-	if (c->cfg.data_type & MOST_CH_CONTROL)
-		return snprintf(buf, PAGE_SIZE, "control\n");
-	else if (c->cfg.data_type & MOST_CH_ASYNC)
-		return snprintf(buf, PAGE_SIZE, "async\n");
-	else if (c->cfg.data_type & MOST_CH_SYNC)
-		return snprintf(buf, PAGE_SIZE, "sync\n");
-	else if (c->cfg.data_type & MOST_CH_ISOC_AVP)
-		return snprintf(buf, PAGE_SIZE, "isoc_avp\n");
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
+		if (c->cfg.data_type & ch_data_type[i].most_ch_data_type)
+			return snprintf(buf, PAGE_SIZE, ch_data_type[i].name);
+	}
 	return snprintf(buf, PAGE_SIZE, "unconfigured\n");
 }
 
@@ -430,15 +436,16 @@ static ssize_t store_set_datatype(struct most_c_obj *c,
 				  const char *buf,
 				  size_t count)
 {
-	if (!strcmp(buf, "control\n")) {
-		c->cfg.data_type = MOST_CH_CONTROL;
-	} else if (!strcmp(buf, "async\n")) {
-		c->cfg.data_type = MOST_CH_ASYNC;
-	} else if (!strcmp(buf, "sync\n")) {
-		c->cfg.data_type = MOST_CH_SYNC;
-	} else if (!strcmp(buf, "isoc_avp\n")) {
-		c->cfg.data_type = MOST_CH_ISOC_AVP;
-	} else {
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
+		if (!strcmp(buf, ch_data_type[i].name)) {
+			c->cfg.data_type = ch_data_type[i].most_ch_data_type;
+			break;
+		}
+	}
+
+	if (i == ARRAY_SIZE(ch_data_type)) {
 		pr_info("WARN: invalid attribute settings\n");
 		return -EINVAL;
 	}
-- 
1.9.1
--
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