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uli526x: add support for netpoll 

This patch adds netpoll support for the uli526x ethernet driver --
simply call the interrupt handler for polling.

To do this without disable_irq()/enable_irq() pair we should fully
protect the handler. Luckily, it's already using irqsave spinlock,
the only unprotected place is interrupts re-enabling write. It was
safe to re-enable interrupts without holding the spinlock, but with
netpoll possibility now it doesn't seem so.

Patch was tested using netconsole and KGDBoE.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Anton Vorontsov 2008-05-16 23:04:51 +04:00 committed by Jeff Garzik
parent 7f80202bb9
commit 7fa0cba330
1 changed files with 15 additions and 1 deletions
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16
drivers/net/tulip/uli526x.c
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@ -225,6 +225,9 @@ static void uli526x_set_filter_mode(struct net_device *);
static const struct ethtool_ops netdev_ethtool_ops;
static u16 read_srom_word(long, int);
static irqreturn_t uli526x_interrupt(int, void *);
#ifdef CONFIG_NET_POLL_CONTROLLER
static void uli526x_poll(struct net_device *dev);
#endif
static void uli526x_descriptor_init(struct uli526x_board_info *, unsigned long);
static void allocate_rx_buffer(struct uli526x_board_info *);
static void update_cr6(u32, unsigned long);
@ -339,6 +342,9 @@ static int __devinit uli526x_init_one (struct pci_dev *pdev,
dev->get_stats = &uli526x_get_stats;
dev->set_multicast_list = &uli526x_set_filter_mode;
dev->ethtool_ops = &netdev_ethtool_ops;
#ifdef CONFIG_NET_POLL_CONTROLLER
dev->poll_controller = &uli526x_poll;
#endif
spin_lock_init(&db->lock);
@ -681,8 +687,9 @@ static irqreturn_t uli526x_interrupt(int irq, void *dev_id)
db->cr5_data = inl(ioaddr + DCR5);
outl(db->cr5_data, ioaddr + DCR5);
if ( !(db->cr5_data & 0x180c1) ) {
spin_unlock_irqrestore(&db->lock, flags);
/* Restore CR7 to enable interrupt mask */
outl(db->cr7_data, ioaddr + DCR7);
spin_unlock_irqrestore(&db->lock, flags);
return IRQ_HANDLED;
}
@ -715,6 +722,13 @@ static irqreturn_t uli526x_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void uli526x_poll(struct net_device *dev)
{
/* ISR grabs the irqsave lock, so this should be safe */
uli526x_interrupt(dev->irq, dev);
}
#endif
/*
* Free TX resource after TX complete