From 836cf7faf8c75743477ed6ed341cce491f3183fb Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Tue, 10 Nov 2009 14:11:08 +0000 Subject: [PATCH] gianfar: Fix race between gfar_error() and gfar_start_xmit() gfar_error() can arrive at the middle of gfar_start_xmit() processing, and so it can trigger transfers of BDs that we don't yet expect to be transmitted. Fix this by locking the tx queues in gfar_error(). Signed-off-by: Anton Vorontsov Acked-by: Kumar Gala Signed-off-by: David S. Miller --- drivers/net/gianfar.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c index a5b0038a8d98..fde430a0b84b 100644 --- a/drivers/net/gianfar.c +++ b/drivers/net/gianfar.c @@ -2943,14 +2943,22 @@ static irqreturn_t gfar_error(int irq, void *grp_id) if (events & IEVENT_CRL) dev->stats.tx_aborted_errors++; if (events & IEVENT_XFUN) { + unsigned long flags; + if (netif_msg_tx_err(priv)) printk(KERN_DEBUG "%s: TX FIFO underrun, " "packet dropped.\n", dev->name); dev->stats.tx_dropped++; priv->extra_stats.tx_underrun++; + local_irq_save(flags); + lock_tx_qs(priv); + /* Reactivate the Tx Queues */ gfar_write(®s->tstat, gfargrp->tstat); + + unlock_tx_qs(priv); + local_irq_restore(flags); } if (netif_msg_tx_err(priv)) printk(KERN_DEBUG "%s: Transmit Error\n", dev->name); -- 2.20.1