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Commit 32737e93 authored by Mark Lord's avatar Mark Lord Committed by David S. Miller
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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: default avatarMark Lord <mlord@pobox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cf9b94f8

drivers/net/b44.c

+9 −0
Original line number Diff line number Diff line
@@ -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;