netdev - [PATCH net-next v2 4/7] drivers: net: smc911x: Fix set but unused status because of DBG macro

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20201104154858.1247725-5-andrew@lunn.ch>
Date:   Wed,  4 Nov 2020 16:48:55 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>, Nicolas Pitre <nico@...xnic.net>,
        David Laight <David.Laight@...LAB.COM>,
        Lee Jones <lee.jones@...aro.org>, Andrew Lunn <andrew@...n.ch>
Subject: [PATCH net-next v2 4/7] drivers: net: smc911x: Fix set but unused status because of DBG macro

drivers/net/ethernet/smsc/smc911x.c: In function ‘smc911x_timeout’:
drivers/net/ethernet/smsc/smc911x.c:1251:6: warning: variable ‘status’ set but not used [-Wunused-but-set-variable]
 1251 |  int status, mask;

The status is read in order to print it via the DBG macro. However,
due to the way DBG is disabled, the compiler never sees it being used.

Change the DBG macro to actually make use of the passed parameters,
and the leave the optimiser to remove the unwanted code inside the
while (0).

Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/ethernet/smsc/smc911x.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/smsc/smc911x.c b/drivers/net/ethernet/smsc/smc911x.c
index 8f748a0c057e..6978050496ac 100644
--- a/drivers/net/ethernet/smsc/smc911x.c
+++ b/drivers/net/ethernet/smsc/smc911x.c
@@ -102,7 +102,10 @@ MODULE_ALIAS("platform:smc911x");
 
 #define PRINTK(dev, args...)   netdev_info(dev, args)
 #else
-#define DBG(n, dev, args...)   do { } while (0)
+#define DBG(n, dev, args...)			 \
+	while (0) {				 \
+		netdev_dbg(dev, args);		 \
+	}
 #define PRINTK(dev, args...)   netdev_dbg(dev, args)
 #endif
 
-- 
2.28.0