From: Mark Lord Date: Sat, 4 Sep 2010 14:17:59 +0000 (+0000) Subject: PATCH: b44 Handle RX FIFO overflow better (simplified) X-Git-Tag: v3.0~3155^2~120 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=32737e934a952c1b0c744f2a78d80089d15c7ee3;p=platform%2Fkernel%2Flinux-amlogic.git 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 Signed-off-by: David S. Miller --- diff --git a/drivers/net/b44.c b/drivers/net/b44.c index 37617ab..1e620e2 100644 --- 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;