PATCH: b44 Handle RX FIFO overflow better (simplified)
This patch is a simplified version of the original patch from James Courtier-Dutton. >From: James Courtier-Dutton >Subject: [PATCH] Fix b44 RX FIFO overflow recovery. >Date: Wednesday, June 30, 2010 - 1:11 pm > >This patch improves the recovery after a RX FIFO overflow on the b44 >Ethernet NIC. >Before it would do a complete chip reset, resulting is loss of link >for a few seconds. >This patch improves this to do recovery in about 20ms without loss of link. > >Signed off by: James@superbug.co.uk Signed-off-by: Mark Lord <mlord@pobox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -848,6 +848,15 @@ static int b44_poll(struct napi_struct *napi, int budget)
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b44_tx(bp);
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/* spin_unlock(&bp->tx_lock); */
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}
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if (bp->istat & ISTAT_RFO) { /* fast recovery, in ~20msec */
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bp->istat &= ~ISTAT_RFO;
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b44_disable_ints(bp);
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ssb_device_enable(bp->sdev, 0); /* resets ISTAT_RFO */
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b44_init_rings(bp);
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b44_init_hw(bp, B44_FULL_RESET_SKIP_PHY);
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netif_wake_queue(bp->dev);
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}
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spin_unlock_irqrestore(&bp->lock, flags);
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work_done = 0;
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