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>

diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index 37617abc164769aa5f8be38a797ea4337a3585e0..1e620e287ae0cc9fbe9894a105fedbfdc9fbb6be 100644 (file)
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -848,6 +848,15 @@ static int b44_poll(struct napi_struct *napi, int budget)
                b44_tx(bp);
                /* spin_unlock(&bp->tx_lock); */
        }
+       if (bp->istat & ISTAT_RFO) {    /* fast recovery, in ~20msec */
+               bp->istat &= ~ISTAT_RFO;
+               b44_disable_ints(bp);
+               ssb_device_enable(bp->sdev, 0); /* resets ISTAT_RFO */
+               b44_init_rings(bp);
+               b44_init_hw(bp, B44_FULL_RESET_SKIP_PHY);
+               netif_wake_queue(bp->dev);
+       }
+
        spin_unlock_irqrestore(&bp->lock, flags);
 
        work_done = 0;