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Date: Sat, 04 Sep 2010 20:17:59 -0400 From: Mark Lord <kernel@...savvy.com> To: "linux-kernel-owner@...r.kernel.org" <linux-kernel-owner@...r.kernel.org> Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, James@...erbug.co.uk Subject: 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@...erbug.co.uk Signed-off-by: Mark Lord <mlord@...ox.com> --- a/drivers/net/b44.c 2010-09-04 20:02:27.539248270 -0400 +++ b/drivers/net/b44.c 2010-09-04 20:07:03.749248234 -0400 @@ -851,6 +851,15 @@ 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; -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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