From 8707bdd48ab705a459ac1b12014075a139d1d4f9 Mon Sep 17 00:00:00 2001 From: Jarek Poplawski Date: Mon, 9 Feb 2009 14:59:30 -0800 Subject: [PATCH] gianfar: Fix boot hangs while bringing up gianfar ethernet Ira Snyder found that commit 8c7396aebb68994c0519e438eecdf4d5fa9c7844 "gianfar: Merge Tx and Rx interrupt for scheduling clean up ring" can cause hangs. It's because there was removed clearing of interrupts in gfar_schedule_cleanup() (which is called by an interrupt handler) in case when netif scheduling has been disabled. This patch brings back this action and a comment. Reported-by: Ira Snyder Reported-by: Peter Korsgaard Bisected-by: Ira Snyder Tested-by: Peter Korsgaard Tested-by: Ira Snyder Signed-off-by: Jarek Poplawski Signed-off-by: David S. Miller --- drivers/net/gianfar.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c index acae2d8cd68..9b12a13a640 100644 --- a/drivers/net/gianfar.c +++ b/drivers/net/gianfar.c @@ -1629,6 +1629,12 @@ static void gfar_schedule_cleanup(struct net_device *dev) if (netif_rx_schedule_prep(&priv->napi)) { gfar_write(&priv->regs->imask, IMASK_RTX_DISABLED); __netif_rx_schedule(&priv->napi); + } else { + /* + * Clear IEVENT, so interrupts aren't called again + * because of the packets that have already arrived. + */ + gfar_write(&priv->regs->ievent, IEVENT_RTX_MASK); } spin_unlock(&priv->rxlock); -- 2.41.1