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net cpsw: fix rx stability under heavy network load 

RX DMA Head Descriptor Pointer can get 0 when there is a lot of traffic,
which results in a timeout error. A good way to provoke this error is by
sending lots of ARP requests. This patch makes sure that the RX DMA Head
Descriptor Pointer is set.

The origin driver, from which this is derived, already contains this fix.

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Christoph Fritz 2014-04-30 10:32:02 +02:00 committed by Sascha Hauer
parent 5dafef6aaf
commit 7af9c3a843
1 changed files with 6 additions and 1 deletions
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7
drivers/net/cpsw.c
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@ -741,8 +741,13 @@ static int cpdma_process(struct cpsw_priv *priv, struct cpdma_chan *chan,
if (buffer)
*buffer = (void *)readl(&desc->sw_buffer);
if (status & CPDMA_DESC_OWNER)
if (status & CPDMA_DESC_OWNER) {
if (readl(chan->hdp) == 0) {
if (readl(&desc->hw_mode) & CPDMA_DESC_OWNER)
writel((u32)desc, chan->hdp);
}
return -EBUSY;
}
chan->head = (void *)readl(&desc->hw_next);