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Message-ID: <20080321180658.24164.18376.stgit@localhost.localdomain>
Date: Fri, 21 Mar 2008 11:06:58 -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 7/9] e1000: remove irq_sem
From: Jesse Brandeburg <jesse.brandeburg@...el.com>
irq_sem was just a hack to prevent interrupts from being enabled
unexpectedly in deep call paths. Simply finding those call paths and
fixing them by hand results in a driver that behaves as we expect and
doesn't need the atomic at all.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
---
drivers/net/e1000/e1000.h | 1 -
drivers/net/e1000/e1000_main.c | 41 +++++++++++++++-------------------------
2 files changed, 15 insertions(+), 27 deletions(-)
diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index d73a6c1..a05aa51 100644
--- a/drivers/net/e1000/e1000.h
+++ b/drivers/net/e1000/e1000.h
@@ -249,7 +249,6 @@ struct e1000_adapter {
#ifdef CONFIG_E1000_NAPI
spinlock_t tx_queue_lock;
#endif
- atomic_t irq_sem;
unsigned int total_tx_bytes;
unsigned int total_tx_packets;
unsigned int total_rx_bytes;
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 37c4655..757d02f 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -347,7 +347,6 @@ static void e1000_free_irq(struct e1000_adapter *adapter)
static void
e1000_irq_disable(struct e1000_adapter *adapter)
{
- atomic_inc(&adapter->irq_sem);
E1000_WRITE_REG(&adapter->hw, IMC, ~0);
E1000_WRITE_FLUSH(&adapter->hw);
synchronize_irq(adapter->pdev->irq);
@@ -361,10 +360,8 @@ e1000_irq_disable(struct e1000_adapter *adapter)
static void
e1000_irq_enable(struct e1000_adapter *adapter)
{
- if (likely(atomic_dec_and_test(&adapter->irq_sem))) {
- E1000_WRITE_REG(&adapter->hw, IMS, IMS_ENABLE_MASK);
- E1000_WRITE_FLUSH(&adapter->hw);
- }
+ E1000_WRITE_REG(&adapter->hw, IMS, IMS_ENABLE_MASK);
+ E1000_WRITE_FLUSH(&adapter->hw);
}
static void
@@ -638,7 +635,6 @@ e1000_down(struct e1000_adapter *adapter)
#ifdef CONFIG_E1000_NAPI
napi_disable(&adapter->napi);
- atomic_set(&adapter->irq_sem, 0);
#endif
e1000_irq_disable(adapter);
@@ -1396,7 +1392,6 @@ e1000_sw_init(struct e1000_adapter *adapter)
#endif
/* 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);
@@ -3836,11 +3831,8 @@ e1000_intr_msi(int irq, void *data)
#endif
uint32_t icr = E1000_READ_REG(hw, ICR);
-#ifdef CONFIG_E1000_NAPI
- /* read ICR disables interrupts using IAM, so keep up with our
- * enable/disable accounting */
- atomic_inc(&adapter->irq_sem);
-#endif
+ /* in NAPI mode read ICR disables interrupts using IAM */
+
if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
hw->get_link_status = 1;
/* 80003ES2LAN workaround-- For packet buffer work-around on
@@ -3910,12 +3902,8 @@ e1000_intr(int irq, void *data)
!(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. */
- if (likely(hw->mac_type >= e1000_82571))
- atomic_inc(&adapter->irq_sem);
+ /* Interrupt Auto-Mask...upon reading ICR, interrupts are masked. No
+ * need for the IMC write */
#endif
if (unlikely(icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))) {
@@ -3939,7 +3927,6 @@ e1000_intr(int irq, void *data)
#ifdef CONFIG_E1000_NAPI
if (unlikely(hw->mac_type < e1000_82571)) {
/* disable interrupts, without the synchronize_irq bit */
- atomic_inc(&adapter->irq_sem);
E1000_WRITE_REG(hw, IMC, ~0);
E1000_WRITE_FLUSH(hw);
}
@@ -3964,10 +3951,8 @@ e1000_intr(int irq, void *data)
* in dead lock. Writing IMC forces 82547 into
* de-assertion state.
*/
- if (hw->mac_type == e1000_82547 || hw->mac_type == e1000_82547_rev_2) {
- atomic_inc(&adapter->irq_sem);
+ if (hw->mac_type == e1000_82547 || hw->mac_type == e1000_82547_rev_2)
E1000_WRITE_REG(hw, IMC, ~0);
- }
adapter->total_tx_bytes = 0;
adapter->total_rx_bytes = 0;
@@ -5001,7 +4986,8 @@ e1000_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
struct e1000_adapter *adapter = netdev_priv(netdev);
uint32_t ctrl, rctl;
- e1000_irq_disable(adapter);
+ if (!test_bit(__E1000_DOWN, &adapter->flags))
+ e1000_irq_disable(adapter);
adapter->vlgrp = grp;
if (grp) {
@@ -5038,7 +5024,8 @@ e1000_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
}
}
- e1000_irq_enable(adapter);
+ if (!test_bit(__E1000_DOWN, &adapter->flags))
+ e1000_irq_enable(adapter);
}
static void
@@ -5064,9 +5051,11 @@ e1000_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
struct e1000_adapter *adapter = netdev_priv(netdev);
uint32_t vfta, index;
- e1000_irq_disable(adapter);
+ if (!test_bit(__E1000_DOWN, &adapter->flags))
+ e1000_irq_disable(adapter);
vlan_group_set_device(adapter->vlgrp, vid, NULL);
- e1000_irq_enable(adapter);
+ if (!test_bit(__E1000_DOWN, &adapter->flags))
+ e1000_irq_enable(adapter);
if ((adapter->hw.mng_cookie.status &
E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
--
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