linux-kernel - [PATCH 2/5] drivers/net: drop redundant memset

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Date:	Tue, 9 Mar 2010 22:14:11 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Ramkrishna Vepa <ram.vepa@...erion.com>,
	Rastapur Santosh <santosh.rastapur@...erion.com>,
	Sivakumar Subramani <sivakumar.subramani@...erion.com>,
	Sreenivasa Honnur <sreenivasa.honnur@...erion.com>,
	Anil Murthy <anil.murthy@...erion.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 2/5] drivers/net: drop redundant memset

From: Julia Lawall <julia@...u.dk>

The region set by the call to memset is immediately overwritten by the
subsequent call to memcpy.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e1,e2,e3,e4;
@@

- memset(e1,e2,e3);
  memcpy(e1,e4,e3);
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/net/s2io.c                  |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index df70657..2eb7f8a 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -5819,10 +5819,8 @@ static void s2io_vpd_read(struct s2io_nic *nic)
 		}
 	}
 
-	if ((!fail) && (vpd_data[1] < VPD_STRING_LEN)) {
-		memset(nic->product_name, 0, vpd_data[1]);
+	if ((!fail) && (vpd_data[1] < VPD_STRING_LEN))
 		memcpy(nic->product_name, &vpd_data[3], vpd_data[1]);
-	}
 	kfree(vpd_data);
 	swstats->mem_freed += 256;
 }
--
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