netdev - [net-next 4/4] stmmac: use one memset() to reset TDES01

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Date:	Fri, 17 Sep 2010 15:23:42 +0200
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	netdev@...r.kernel.org
Cc:	Giuseppe Cavallaro <peppe.cavallaro@...com>
Subject: [net-next 4/4] stmmac: use one memset() to reset TDES01

Use one memset() to reset all TDES01 fields instead
of one by one to reduce number of instructions.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
---
 drivers/net/stmmac/enh_desc.c  |    2 +-
 drivers/net/stmmac/norm_desc.c |   17 +----------------
 2 files changed, 2 insertions(+), 17 deletions(-)

diff --git a/drivers/net/stmmac/enh_desc.c b/drivers/net/stmmac/enh_desc.c
index 77ff88c..5d1471d 100644
--- a/drivers/net/stmmac/enh_desc.c
+++ b/drivers/net/stmmac/enh_desc.c
@@ -284,7 +284,7 @@ static void enh_desc_release_tx_desc(struct dma_desc *p)
 {
 	int ter = p->des01.etx.end_ring;
 
-	memset(p, 0, sizeof(struct dma_desc));
+	memset(p, 0, offsetof(struct dma_desc, des2));
 	p->des01.etx.end_ring = ter;
 }
 
diff --git a/drivers/net/stmmac/norm_desc.c b/drivers/net/stmmac/norm_desc.c
index 51f4440..0dce90c 100644
--- a/drivers/net/stmmac/norm_desc.c
+++ b/drivers/net/stmmac/norm_desc.c
@@ -174,22 +174,7 @@ static void ndesc_release_tx_desc(struct dma_desc *p)
 {
 	int ter = p->des01.tx.end_ring;
 
-	/* clean field used within the xmit */
-	p->des01.tx.first_segment = 0;
-	p->des01.tx.last_segment = 0;
-	p->des01.tx.buffer1_size = 0;
-
-	/* clean status reported */
-	p->des01.tx.error_summary = 0;
-	p->des01.tx.underflow_error = 0;
-	p->des01.tx.no_carrier = 0;
-	p->des01.tx.loss_carrier = 0;
-	p->des01.tx.excessive_deferral = 0;
-	p->des01.tx.excessive_collisions = 0;
-	p->des01.tx.late_collision = 0;
-	p->des01.tx.heartbeat_fail = 0;
-	p->des01.tx.deferred = 0;
-
+	memset(p, 0, offsetof(struct dma_desc, des2));
 	/* set termination field */
 	p->des01.tx.end_ring = ter;
 }
-- 
1.7.0.4

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