netdev - [PATCH v2 2/3] via-velocity: Take spinlock on set coalesce

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Message-ID: <20100210103807.79de5c9a@marrow.netinsight.se>
Date:	Wed, 10 Feb 2010 10:38:07 +0100
From:	Simon Kagstrom <simon.kagstrom@...insight.net>
To:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Cc:	davej@...hat.com, ben@...adent.org.uk
Subject: [PATCH v2 2/3] via-velocity: Take spinlock on set coalesce

velocity_set_coalesce touches ISR and some other sensitive registers not
covered by the rtnl lock, so take the velocity spinlock.

Signed-off-by: Simon Kagstrom <simon.kagstrom@...insight.net>
---
 drivers/net/via-velocity.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
index 5c73673..5e213f7 100644
--- a/drivers/net/via-velocity.c
+++ b/drivers/net/via-velocity.c
@@ -3341,6 +3341,7 @@ static int velocity_set_coalesce(struct net_device *dev,
 {
 	struct velocity_info *vptr = netdev_priv(dev);
 	int max_us = 0x3f * 64;
+	unsigned long flags;
 
 	/* 6 bits of  */
 	if (ecmd->tx_coalesce_usecs > max_us)
@@ -3362,6 +3363,7 @@ static int velocity_set_coalesce(struct net_device *dev,
 			ecmd->tx_coalesce_usecs);
 
 	/* Setup the interrupt suppression and queue timers */
+	spin_lock_irqsave(&vptr->lock, flags);
 	mac_disable_int(vptr->mac_regs);
 	setup_adaptive_interrupts(vptr);
 	setup_queue_timers(vptr);
@@ -3369,6 +3371,7 @@ static int velocity_set_coalesce(struct net_device *dev,
 	mac_write_int_mask(vptr->int_mask, vptr->mac_regs);
 	mac_clear_isr(vptr->mac_regs);
 	mac_enable_int(vptr->mac_regs);
+	spin_unlock_irqrestore(&vptr->lock, flags);
 
 	return 0;
 }
-- 
1.6.0.4

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