linux-kernel - [PATCH v2 8/9] isdn: Remove unused variable causing a compile build warning

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Message-ID: <20121104102840.GA27124@gmail.com>
Date:	Sun, 4 Nov 2012 11:28:40 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	linux-kernel@...r.kernel.org, Karsten Keil <isdn@...ux-pingi.de>,
	netdev@...r.kernel.org
Subject: [PATCH v2 8/9] isdn: Remove unused variable causing a compile build
 warning

Thanks for reviewing Paul. Here's the result:

Author: Lee Jones <lee.jones@...aro.org>
Date:   Sat Nov 3 22:06:02 2012 +0100

    isdn: Encapsulate variable 's' in same CONFIG_NETDEVICES guards as code using it
    
    In the current case, variable 's' of type 'char *' is defined but then
    not used if !CONFIG_NETDEVICES, casing the compile-time warning below.
    In this change we surround the declaration using the same guards as
    the pre-processed code which makes use of it.
    
    This patch fixes:
    drivers/isdn/i4l/isdn_common.c: In function ‘isdn_ioctl’:
    drivers/isdn/i4l/isdn_common.c:1278:8: warning: unused variable ‘s’ [-Wunused-variable]
    
    Cc: Karsten Keil <isdn@...ux-pingi.de>
    Cc: netdev@...r.kernel.org
    Signed-off-by: Lee Jones <lee.jones@...aro.org>

diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c
index 8c610fa..2875f31 100644
--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -1275,7 +1275,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
 	int ret;
 	int i;
 	char __user *p;
-	char *s;
 	union iocpar {
 		char name[10];
 		char bname[22];
@@ -1284,6 +1283,9 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
 		isdn_net_ioctl_cfg cfg;
 	} iocpar;
 	void __user *argp = (void __user *)arg;
+#ifdef CONFIG_NETDEVICES
+	char *s;
+#endif
 
 #define name  iocpar.name
 #define bname iocpar.bname
--
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