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Message-Id: <20080107.214034.227601954.davem@davemloft.net>
Date: Mon, 07 Jan 2008 21:40:34 -0800 (PST)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH 5/7]: [NET]: Fix drivers to handle napi_disable() disabling
interrupts.
[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 <davem@...emloft.net>
---
drivers/net/pcnet32.c | 5 +++++
drivers/net/r8169.c | 2 ++
drivers/net/sky2.c | 3 +++
3 files changed, 10 insertions(+), 0 deletions(-)
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..af80309 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;
}
--
1.5.4.rc2.38.gd6da3
--
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