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gianfar: Revive VLAN support 

commit 77ecaf2d5a ("gianfar: Fix VLAN
HW feature related frame/buffer size calculation") wrongly removed
priv->vlgrp assignment, and now priv->vlgrp is always NULL.

This patch fixes the issue, plus fixes following sparse warning
introduced by the same commit:
gianfar.c:1406:13: warning: context imbalance in 'gfar_vlan_rx_register' - wrong count at exit

gfar_vlan_rx_register() checks for "if (old_grp == grp)" and tries
to return w/o dropping the lock.

According to net/8021q/vlan.c VLAN core issues rx_register() callback:
1. In register_vlan_dev() only on a newly created group;
2. In unregister_vlan_dev() only if the group becomes empty.

Thus the check in the gianfar driver isn't needed.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Anton Vorontsov 2009-01-26 14:33:23 -08:00 committed by David S. Miller
parent 116cb42855
commit cd1f55a5b4
1 changed files with 1 additions and 5 deletions
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6
drivers/net/gianfar.c
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@ -1423,15 +1423,11 @@ static void gfar_vlan_rx_register(struct net_device *dev,
{
struct gfar_private *priv = netdev_priv(dev);
unsigned long flags;
struct vlan_group *old_grp;
u32 tempval;
spin_lock_irqsave(&priv->rxlock, flags);
old_grp = priv->vlgrp;
if (old_grp == grp)
return;
priv->vlgrp = grp;
if (grp) {
/* Enable VLAN tag insertion */