netdev - [PATCH] tc35815: Fix receiver hangup on Rx FIFO overflow

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Message-Id: <20080626.171415.81099548.nemoto@toshiba-tops.co.jp>
Date:	Thu, 26 Jun 2008 17:14:15 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	linux-mips@...ux-mips.org
Cc:	Jeff Garzik <jeff@...zik.org>, netdev@...r.kernel.org
Subject: [PATCH] tc35815: Fix receiver hangup on Rx FIFO overflow

On Rx FIFO overflow error, the controller consume a buffer descriptor
but currently the driver does not give it back to the controller.
This results unrecoverable 'Buffer List Exhausted' condition.  This
patch fix this problem by moving a "fbl_count--" line to proper place.

Signed-off-by: Atsushi Nemoto <anemo@....ocn.ne.jp>
---
diff --git a/drivers/net/tc35815.c b/drivers/net/tc35815.c
index dccea52..b07b8cb 100644
--- a/drivers/net/tc35815.c
+++ b/drivers/net/tc35815.c
@@ -1736,7 +1736,6 @@ tc35815_rx(struct net_device *dev)
 			skb = lp->rx_skbs[cur_bd].skb;
 			prefetch(skb->data);
 			lp->rx_skbs[cur_bd].skb = NULL;
-			lp->fbl_count--;
 			pci_unmap_single(lp->pci_dev,
 					 lp->rx_skbs[cur_bd].skb_dma,
 					 RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
@@ -1792,6 +1791,7 @@ tc35815_rx(struct net_device *dev)
 #ifdef TC35815_USE_PACKEDBUFFER
 			while (lp->fbl_curid != id)
 #else
+			lp->fbl_count--;
 			while (lp->fbl_count < RX_BUF_NUM)
 #endif
 			{
--
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