-stable review patch. If anyone has any objections, please let us know.
------------------
Fix a race in the receive NAPI, irq handling. The interrupt clear and the
start need to be separated. Otherwise there is a window between the last
frame received and the NAPI done level handling.
Signed-off-by: Stephen Hemminger <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
---
drivers/net/skge.c | 17 +++++------------
1 files changed, 5 insertions(+), 12 deletions(-)
--- linux-2.6.15.4.orig/drivers/net/skge.c
+++ linux-2.6.15.4/drivers/net/skge.c
@@ -2675,8 +2675,7 @@ static int skge_poll(struct net_device *
/* restart receiver */
wmb();
- skge_write8(hw, Q_ADDR(rxqaddr[skge->port], Q_CSR),
- CSR_START | CSR_IRQ_CL_F);
+ skge_write8(hw, Q_ADDR(rxqaddr[skge->port], Q_CSR), CSR_START);
*budget -= work_done;
dev->quota -= work_done;
@@ -2853,14 +2852,6 @@ static void skge_extirq(unsigned long da
local_irq_enable();
}
-static inline void skge_wakeup(struct net_device *dev)
-{
- struct skge_port *skge = netdev_priv(dev);
-
- prefetch(skge->rx_ring.to_clean);
- netif_rx_schedule(dev);
-}
-
static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
{
struct skge_hw *hw = dev_id;
@@ -2871,13 +2862,15 @@ static irqreturn_t skge_intr(int irq, vo
status &= hw->intr_mask;
if (status & IS_R1_F) {
+ skge_write8(hw, Q_ADDR(Q_R1, Q_CSR), CSR_IRQ_CL_F);
hw->intr_mask &= ~IS_R1_F;
- skge_wakeup(hw->dev[0]);
+ netif_rx_schedule(hw->dev[0]);
}
if (status & IS_R2_F) {
+ skge_write8(hw, Q_ADDR(Q_R2, Q_CSR), CSR_IRQ_CL_F);
hw->intr_mask &= ~IS_R2_F;
- skge_wakeup(hw->dev[1]);
+ netif_rx_schedule(hw->dev[1]);
}
if (status & IS_XA1_F)
--
-
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