From 9401bb5c339d2f9529b2f859638440ce92227c83 Mon Sep 17 00:00:00 2001
From: Giuseppe CAVALLARO <peppe.cavallaro@st.com>
Date: Mon, 8 Apr 2013 02:10:03 +0000
Subject: [PATCH] stmmac: prefetch all dma_erx when use extend_desc
This patch is to prefetch, in the stmmac_rx, the whole
dma_erx descriptor in case of using the extended descriptors.
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 8ba05327851ae..71b64857e3a61 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2006,7 +2006,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
#endif
while (count < limit) {
int status;
- struct dma_desc *p, *p_next;
+ struct dma_desc *p;
if (priv->extend_desc)
p = (struct dma_desc *)(priv->dma_erx + entry);
@@ -2020,12 +2020,9 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
next_entry = (++priv->cur_rx) % rxsize;
if (priv->extend_desc)
- p_next = (struct dma_desc *)(priv->dma_erx +
- next_entry);
+ prefetch(priv->dma_erx + next_entry);
else
- p_next = priv->dma_rx + next_entry;
-
- prefetch(p_next);
+ prefetch(priv->dma_rx + next_entry);
/* read the status of the incoming frame */
status = priv->hw->desc->rx_status(&priv->dev->stats,
--
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