linux-kernel - [PATCH 2/3] staging: r8188eu: refactor rtw

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Message-Id: <20220220154847.7521-3-straube.linux@gmail.com>
Date:   Sun, 20 Feb 2022 16:48:46 +0100
From:   Michael Straube <straube.linux@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Michael Straube <straube.linux@...il.com>
Subject: [PATCH 2/3] staging: r8188eu: refactor rtw_ch2freq()

Since we have only channel values from 1 to 14 we can convert the
array ch_freq_map to a simple integer array and use the indices as
channel numbers. This simplifies the code and avoids looping through
the array to get the frequency.

Signed-off-by: Michael Straube <straube.linux@...il.com>
---
 drivers/staging/r8188eu/core/rtw_rf.c | 40 +++++++++++----------------
 1 file changed, 16 insertions(+), 24 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_rf.c b/drivers/staging/r8188eu/core/rtw_rf.c
index 51425971782b..945a40e6511a 100644
--- a/drivers/staging/r8188eu/core/rtw_rf.c
+++ b/drivers/staging/r8188eu/core/rtw_rf.c
@@ -8,32 +8,24 @@
 #include "../include/recv_osdep.h"
 #include "../include/xmit_osdep.h"
 
-struct ch_freq {
-	u32 channel;
-	u32 frequency;
+static const u32 ch_freq_map[] = {
+	2412,
+	2417,
+	2422,
+	2427,
+	2432,
+	2437,
+	2442,
+	2447,
+	2452,
+	2457,
+	2462,
+	2467,
+	2472,
+	2484
 };
 
-static struct ch_freq ch_freq_map[] = {
-	{1, 2412}, {2, 2417}, {3, 2422}, {4, 2427}, {5, 2432},
-	{6, 2437}, {7, 2442}, {8, 2447}, {9, 2452}, {10, 2457},
-	{11, 2462}, {12, 2467}, {13, 2472}, {14, 2484},
-};
-
-static int ch_freq_map_num = ARRAY_SIZE(ch_freq_map);
-
 u32 rtw_ch2freq(u32 channel)
 {
-	u8	i;
-	u32	freq = 0;
-
-	for (i = 0; i < ch_freq_map_num; i++) {
-		if (channel == ch_freq_map[i].channel) {
-			freq = ch_freq_map[i].frequency;
-				break;
-		}
-	}
-	if (i == ch_freq_map_num)
-		freq = 2412;
-
-	return freq;
+	return ch_freq_map[channel - 1];
 }
-- 
2.35.1