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netpoll: drivers must not enable IRQ unconditionally in their NAPI handler

Browse source 
net/core/netpoll.c::netpoll_send_skb() calls the poll handler when
it is available. As netconsole can be used from almost any context,
IRQ must not be enabled blindly in the NAPI handler of a driver which
supports netpoll.

b57bd06655 fixed the issue for the
8139too.c driver.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Francois Romieu 2006-12-17 23:03:15 +01:00 committed by Jeff Garzik
parent 79f3d3996f
commit d15e9c4d9a
4 changed files with 18 additions and 10 deletions
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6
drivers/net/8139cp.c
View file

@ -617,13 +617,15 @@ rx_next:
* this round of polling
*/
if (rx_work) {
unsigned long flags;
if (cpr16(IntrStatus) & cp_rx_intr_mask)
goto rx_status_loop;
local_irq_disable();
local_irq_save(flags);
cpw16_f(IntrMask, cp_intr_mask);
__netif_rx_complete(dev);
local_irq_enable();
local_irq_restore(flags);
return 0; /* done */
}

6
drivers/net/b44.c
View file

@ -879,12 +879,14 @@ static int b44_poll(struct net_device *netdev, int *budget)
}
if (bp->istat & ISTAT_ERRORS) {
spin_lock_irq(&bp->lock);
unsigned long flags;
spin_lock_irqsave(&bp->lock, flags);
b44_halt(bp);
b44_init_rings(bp);
b44_init_hw(bp, 1);
netif_wake_queue(bp->dev);
spin_unlock_irq(&bp->lock);
spin_unlock_irqrestore(&bp->lock, flags);
done = 1;
}

11
drivers/net/forcedeth.c
View file

@ -2576,14 +2576,15 @@ static int nv_napi_poll(struct net_device *dev, int *budget)
int pkts, limit = min(*budget, dev->quota);
struct fe_priv *np = netdev_priv(dev);
u8 __iomem *base = get_hwbase(dev);
unsigned long flags;
pkts = nv_rx_process(dev, limit);
if (nv_alloc_rx(dev)) {
spin_lock_irq(&np->lock);
spin_lock_irqsave(&np->lock, flags);
if (!np->in_shutdown)
mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
spin_unlock_irq(&np->lock);
spin_unlock_irqrestore(&np->lock, flags);
}
if (pkts < limit) {
@ -2591,13 +2592,15 @@ static int nv_napi_poll(struct net_device *dev, int *budget)
netif_rx_complete(dev);
/* re-enable receive interrupts */
spin_lock_irq(&np->lock);
spin_lock_irqsave(&np->lock, flags);
np->irqmask |= NVREG_IRQ_RX_ALL;
if (np->msi_flags & NV_MSI_X_ENABLED)
writel(NVREG_IRQ_RX_ALL, base + NvRegIrqMask);
else
writel(np->irqmask, base + NvRegIrqMask);
spin_unlock_irq(&np->lock);
spin_unlock_irqrestore(&np->lock, flags);
return 0;
} else {
/* used up our quantum, so reschedule */

5
drivers/net/skge.c
View file

@ -2920,6 +2920,7 @@ static int skge_poll(struct net_device *dev, int *budget)
struct skge_hw *hw = skge->hw;
struct skge_ring *ring = &skge->rx_ring;
struct skge_element *e;
unsigned long flags;
int to_do = min(dev->quota, *budget);
int work_done = 0;
@ -2957,12 +2958,12 @@ static int skge_poll(struct net_device *dev, int *budget)
if (work_done >= to_do)
return 1; /* not done */
spin_lock_irq(&hw->hw_lock);
spin_lock_irqsave(&hw->hw_lock, flags);
__netif_rx_complete(dev);
hw->intr_mask |= irqmask[skge->port];
skge_write32(hw, B0_IMSK, hw->intr_mask);
skge_read32(hw, B0_IMSK);
spin_unlock_irq(&hw->hw_lock);
spin_unlock_irqrestore(&hw->hw_lock, flags);
return 0;
}