From d1d08d1265810ef1f165864850416dcbc9725ee7 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Mon, 7 Jan 2008 20:53:33 -0800 Subject: [PATCH] [NET]: Fix drivers to handle napi_disable() disabling interrupts. When we add the generic napi_disable_pending() breakout logic to net_rx_action() it means that napi_disable() can cause NAPI poll interrupt events to be disabled. And this is exactly what we want. If a napi_disable() is pending, and we are looping in the ->poll(), we want ->poll() event interrupts to stay disabled and we want to complete the NAPI poll ASAP. When ->poll() break out during device down was being handled on a per-driver basis, often these drivers would turn interrupts back on when '!netif_running()' was detected. And this would just cause a reschedule of the NAPI ->poll() in the interrupt handler before the napi_disable() could get in there and grab the NAPI_STATE_SCHED bit. The vast majority of drivers don't care if napi_disable() might have the side effect of disabling NAPI ->poll() event interrupts. In all such cases, when a napi_disable() is performed, the driver just disabled interrupts or is about to. However there were three exceptions to this in PCNET32, R8169, and SKY2. To fix those cases, at the subsequent napi_enable() points, I added code to ensure that the ->poll() interrupt events are enabled in the hardware. Signed-off-by: David S. Miller Acked-by: Don Fry --- drivers/net/pcnet32.c | 5 +++++ drivers/net/r8169.c | 2 ++ drivers/net/sky2.c | 3 +++ 3 files changed, 10 insertions(+) diff --git a/drivers/net/pcnet32.c b/drivers/net/pcnet32.c index ff92aca..90498ff 100644 --- a/drivers/net/pcnet32.c +++ b/drivers/net/pcnet32.c @@ -455,9 +455,14 @@ static void pcnet32_netif_start(struct net_device *dev) { #ifdef CONFIG_PCNET32_NAPI struct pcnet32_private *lp = netdev_priv(dev); + ulong ioaddr = dev->base_addr; + u16 val; #endif netif_wake_queue(dev); #ifdef CONFIG_PCNET32_NAPI + val = lp->a.read_csr(ioaddr, CSR3); + val &= 0x00ff; + lp->a.write_csr(ioaddr, CSR3, val); napi_enable(&lp->napi); #endif } diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c index 5863190..af803098 100644 --- a/drivers/net/r8169.c +++ b/drivers/net/r8169.c @@ -2398,6 +2398,8 @@ static void rtl8169_wait_for_quiescence(struct net_device *dev) rtl8169_irq_mask_and_ack(ioaddr); #ifdef CONFIG_R8169_NAPI + tp->intr_mask = 0xffff; + RTL_W16(IntrMask, tp->intr_event); napi_enable(&tp->napi); #endif } diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index a74fc11..52ec89b 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -1168,6 +1168,7 @@ static void sky2_vlan_rx_register(struct net_device *dev, struct vlan_group *grp TX_VLAN_TAG_OFF); } + sky2_read32(hw, B0_Y2_SP_LISR); napi_enable(&hw->napi); netif_tx_unlock_bh(dev); } @@ -2043,6 +2044,7 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu) err = sky2_rx_start(sky2); sky2_write32(hw, B0_IMSK, imask); + sky2_read32(hw, B0_Y2_SP_LISR); napi_enable(&hw->napi); if (err) @@ -3861,6 +3863,7 @@ static int sky2_debug_show(struct seq_file *seq, void *v) last = sky2_read16(hw, Y2_QADDR(rxqaddr[port], PREF_UNIT_PUT_IDX)), sky2_read16(hw, Y2_QADDR(rxqaddr[port], PREF_UNIT_LAST_IDX))); + sky2_read32(hw, B0_Y2_SP_LISR); napi_enable(&hw->napi); return 0; } -- 2.7.4