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Date: Fri, 21 Mar 2008 11:06:52 -0700
From: Auke Kok <auke-jan.h.kok@...el.com>
To: jeff@...zik.org
Cc: netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net
Subject: [PATCH 6/9] e1000e: remove irq_sem
From: Jesse Brandeburg <jesse.brandeburg@...el.com>
irq_sem can safely be removed by auditing all irq.*able sites to
make sure that interrupts don't get enabled unexpectedly when the
interface is down.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
---
drivers/net/e1000e/e1000.h | 3 ---
drivers/net/e1000e/netdev.c | 37 ++++++++++++++-----------------------
2 files changed, 14 insertions(+), 26 deletions(-)
diff --git a/drivers/net/e1000e/e1000.h b/drivers/net/e1000e/e1000.h
index 6e0c6ed..4bf0c6c 100644
--- a/drivers/net/e1000e/e1000.h
+++ b/drivers/net/e1000e/e1000.h
@@ -167,9 +167,6 @@ struct e1000_adapter {
spinlock_t tx_queue_lock; /* prevent concurrent tail updates */
- /* this is still needed for 82571 and above */
- atomic_t irq_sem;
-
/* track device up/down/testing state */
unsigned long state;
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index fc5c63f..f501dd5 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -836,9 +836,7 @@ static irqreturn_t e1000_intr_msi(int irq, void *data)
struct e1000_hw *hw = &adapter->hw;
u32 icr = er32(ICR);
- /* read ICR disables interrupts using IAM, so keep up with our
- * enable/disable accounting */
- atomic_inc(&adapter->irq_sem);
+ /* read ICR disables interrupts using IAM */
if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
hw->mac.get_link_status = 1;
@@ -868,8 +866,6 @@ static irqreturn_t e1000_intr_msi(int irq, void *data)
adapter->total_rx_bytes = 0;
adapter->total_rx_packets = 0;
__netif_rx_schedule(netdev, &adapter->napi);
- } else {
- atomic_dec(&adapter->irq_sem);
}
return IRQ_HANDLED;
@@ -895,11 +891,8 @@ static irqreturn_t e1000_intr(int irq, void *data)
if (!(icr & E1000_ICR_INT_ASSERTED))
return IRQ_NONE;
- /* Interrupt Auto-Mask...upon reading ICR,
- * interrupts are masked. No need for the
- * IMC write, but it does mean we should
- * account for it ASAP. */
- atomic_inc(&adapter->irq_sem);
+ /* Interrupt Auto-Mask...upon reading ICR, interrupts are masked. No
+ * need for the IMC write */
if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
hw->mac.get_link_status = 1;
@@ -931,8 +924,6 @@ static irqreturn_t e1000_intr(int irq, void *data)
adapter->total_rx_bytes = 0;
adapter->total_rx_packets = 0;
__netif_rx_schedule(netdev, &adapter->napi);
- } else {
- atomic_dec(&adapter->irq_sem);
}
return IRQ_HANDLED;
@@ -983,7 +974,6 @@ static void e1000_irq_disable(struct e1000_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
- atomic_inc(&adapter->irq_sem);
ew32(IMC, ~0);
e1e_flush();
synchronize_irq(adapter->pdev->irq);
@@ -996,10 +986,8 @@ static void e1000_irq_enable(struct e1000_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
- if (atomic_dec_and_test(&adapter->irq_sem)) {
- ew32(IMS, IMS_ENABLE_MASK);
- e1e_flush();
- }
+ ew32(IMS, IMS_ENABLE_MASK);
+ e1e_flush();
}
/**
@@ -1427,9 +1415,12 @@ static void e1000_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
struct e1000_hw *hw = &adapter->hw;
u32 vfta, index;
- e1000_irq_disable(adapter);
+ if (!test_bit(__E1000_DOWN, &adapter->state))
+ e1000_irq_disable(adapter);
vlan_group_set_device(adapter->vlgrp, vid, NULL);
- e1000_irq_enable(adapter);
+
+ if (!test_bit(__E1000_DOWN, &adapter->state))
+ e1000_irq_enable(adapter);
if ((adapter->hw.mng_cookie.status &
E1000_MNG_DHCP_COOKIE_STATUS_VLAN) &&
@@ -1480,7 +1471,8 @@ static void e1000_vlan_rx_register(struct net_device *netdev,
struct e1000_hw *hw = &adapter->hw;
u32 ctrl, rctl;
- e1000_irq_disable(adapter);
+ if (!test_bit(__E1000_DOWN, &adapter->state))
+ e1000_irq_disable(adapter);
adapter->vlgrp = grp;
if (grp) {
@@ -1517,7 +1509,8 @@ static void e1000_vlan_rx_register(struct net_device *netdev,
}
}
- e1000_irq_enable(adapter);
+ if (!test_bit(__E1000_DOWN, &adapter->state))
+ e1000_irq_enable(adapter);
}
static void e1000_restore_vlan(struct e1000_adapter *adapter)
@@ -2167,7 +2160,6 @@ void e1000e_down(struct e1000_adapter *adapter)
msleep(10);
napi_disable(&adapter->napi);
- atomic_set(&adapter->irq_sem, 0);
e1000_irq_disable(adapter);
del_timer_sync(&adapter->watchdog_timer);
@@ -2227,7 +2219,6 @@ static int __devinit e1000_sw_init(struct e1000_adapter *adapter)
spin_lock_init(&adapter->tx_queue_lock);
/* Explicitly disable IRQ since the NIC can be in any state. */
- atomic_set(&adapter->irq_sem, 0);
e1000_irq_disable(adapter);
spin_lock_init(&adapter->stats_lock);
--
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