netdev - [PATCH] atm: fore200e: Fix build warning.

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Message-Id: <20101118.115331.233701526.davem@davemloft.net>
Date:	Thu, 18 Nov 2010 11:53:31 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
Subject: [PATCH] atm: fore200e: Fix build warning.


GCC (rightfully) complains that:

drivers/atm/fore200e.c:614:5: warning: operation on 'cmdq->head' may be undefined

This is due to the FORE200E_NEXT_ENTRY macro, which essentially
evaluates to:

	i = ++i % m

Make it what's explicitly intended here which is:

	i = (i + 1) % m

and the warning goes away.

Signed-off-by: David S. Miller <davem@...emloft.net>
---
 drivers/atm/fore200e.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/atm/fore200e.c b/drivers/atm/fore200e.c
index c8fc69c..c097619 100644
--- a/drivers/atm/fore200e.c
+++ b/drivers/atm/fore200e.c
@@ -92,7 +92,7 @@
 
 #define FORE200E_INDEX(virt_addr, type, index)     (&((type *)(virt_addr))[ index ])
 
-#define FORE200E_NEXT_ENTRY(index, modulo)         (index = ++(index) % (modulo))
+#define FORE200E_NEXT_ENTRY(index, modulo)         (index = ((index) + 1) % (modulo))
 
 #if 1
 #define ASSERT(expr)     if (!(expr)) { \
-- 
1.7.3.2

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