linux-kernel - [PATCH 3/3] staging: wilc1000: Reduce scope for a few variables in mac

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Date:	Sun, 24 Jul 2016 22:23:22 +0200
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	linux-wireless@...r.kernel.org, devel@...verdev.osuosl.org,
	Austin Shin <austin.shin@...el.com>,
	Chris Park <chris.park@...el.com>,
	Glen Lee <glen.lee@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Johnny Kim <johnny.kim@...el.com>, Leo Kim <leo.kim@...el.com>,
	Tony Cho <tony.cho@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 3/3] staging: wilc1000: Reduce scope for a few variables in
 mac_ioctl()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sun, 24 Jul 2016 21:45:37 +0200

Three local variables were used only within a single case branch.

* Thus move the data type definition for "rssi" and "size" into the
  corresponding code block.

* The variable "length" was not modified after its initialisation.
  Thus pass a constant value in the affected function call instead.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/staging/wilc1000/linux_wlan.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/wilc1000/linux_wlan.c b/drivers/staging/wilc1000/linux_wlan.c
index 7b1ebcc..173be16 100644
--- a/drivers/staging/wilc1000/linux_wlan.c
+++ b/drivers/staging/wilc1000/linux_wlan.c
@@ -1094,8 +1094,6 @@ int wilc_mac_close(struct net_device *ndev)
 static int mac_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
 {
 	u8 *buff = NULL;
-	s8 rssi;
-	u32 size = 0, length = 0;
 	struct wilc_vif *vif;
 	s32 ret = 0;
 	struct wilc *wilc;
@@ -1110,8 +1108,7 @@ static int mac_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
 	case SIOCSIWPRIV:
 	{
 		struct iwreq *wrq = (struct iwreq *)req;
-
-		size = wrq->u.data.length;
+		u32 size = wrq->u.data.length;
 
 		if (size && wrq->u.data.pointer) {
 			buff = memdup_user(wrq->u.data.pointer,
@@ -1119,7 +1116,9 @@ static int mac_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
 			if (IS_ERR(buff))
 				return PTR_ERR(buff);
 
-			if (strncasecmp(buff, "RSSI", length) == 0) {
+			if (strncasecmp(buff, "RSSI", 0) == 0) {
+				s8 rssi;
+
 				ret = wilc_get_rssi(vif, &rssi);
 				netdev_info(ndev, "RSSI :%d\n", rssi);
 
-- 
2.9.2