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@netinsight.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
index 133069738ba0..54bafdab1f9d 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;
 }