netdev - [PATCH 3/3] stmmac: fix Transmit Underflow error

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Message-Id: <1302513406-3758-3-git-send-email-peppe.cavallaro@st.com>
Date:	Mon, 11 Apr 2011 11:16:46 +0200
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	netdev@...r.kernel.org
Cc:	Giuseppe Cavallaro <peppe.cavallaro@...com>
Subject: [PATCH 3/3] stmmac: fix Transmit Underflow error

On some old MAC chips without COE sometime the
Transmit Underflow error is issued.

The driver aborted all the transmission process
and initialized it from scratch.
This breaks the network activity as raised by Nachiketa
on a SPEAr board.

The patch is to fix this rare underflow event.
The driver will only clear the interrupt and the Tx
DMA will go out the Suspend state as soon as the
descriptor is fetched again.
The driver will continue to bump-up the DMA FIFO threshold
that, indeed, helped somebody to prevent this kind of error
in the past as well.

Reported-by: Nachiketa Prachanda <nprachanda@...mputing.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
---
 drivers/net/stmmac/stmmac_main.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/net/stmmac/stmmac_main.c b/drivers/net/stmmac/stmmac_main.c
index 442a7ca..ba9daec 100644
--- a/drivers/net/stmmac/stmmac_main.c
+++ b/drivers/net/stmmac/stmmac_main.c
@@ -749,7 +749,6 @@ static void stmmac_dma_interrupt(struct stmmac_priv *priv)
 			priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 			priv->xstats.threshold = tc;
 		}
-		stmmac_tx_err(priv);
 	} else if (unlikely(status == tx_hard_error))
 		stmmac_tx_err(priv);
 }
-- 
1.7.4.2

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