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Subject[patch 4/9] netpoll: drivers must not enable IRQ unconditionally in their NAPI handler
-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Francois Romieu <romieu@fr.zoreil.com>
netpoll: drivers must not enable IRQ unconditionally in their NAPI handler

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.

b57bd06655a028aba7b92e1c19c2093e7fcfb341 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/net/8139cp.c | 6 ++++--
drivers/net/b44.c | 6 ++++--
drivers/net/forcedeth.c | 11 +++++++----
drivers/net/skge.c | 5 +++--
4 files changed, 18 insertions(+), 10 deletions(-)
--- linux-2.6.19.5.orig/drivers/net/8139cp.c
+++ linux-2.6.19.5/drivers/net/8139cp.c
@@ -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 */
}
--- linux-2.6.19.5.orig/drivers/net/b44.c
+++ linux-2.6.19.5/drivers/net/b44.c
@@ -879,12 +879,14 @@ static int b44_poll(struct net_device *n
}

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;
}

--- linux-2.6.19.5.orig/drivers/net/forcedeth.c
+++ linux-2.6.19.5/drivers/net/forcedeth.c
@@ -2544,14 +2544,15 @@ static int nv_napi_poll(struct net_devic
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) {
@@ -2559,13 +2560,15 @@ static int nv_napi_poll(struct net_devic
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 */
--- linux-2.6.19.5.orig/drivers/net/skge.c
+++ linux-2.6.19.5/drivers/net/skge.c
@@ -2919,6 +2919,7 @@ static int skge_poll(struct net_device *
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;

@@ -2956,12 +2957,12 @@ static int skge_poll(struct net_device *
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;
}
--
-
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