netdev - [PATCH 2/3] remove irq

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Date:	Mon, 19 Feb 2007 20:10:18 -0500
From:	"Chris Snook" <csnook@...hat.com>
To:	jeff@...zik.org, jacliburn@...lsouth.net, csnook@...hat.com,
	john.ronciak@...el.com, jesse.brandeburg@...el.com,
	auke-jan.h.kok@...el.com
Cc:	netdev@...r.kernel.org
Subject: [PATCH 2/3] remove irq_sem from e1000

From: Chris Snook <csnook@...hat.com>

Remove unnecessary irq_sem accounting from e1000.  Tested with no problems.

Signed-off-by: Chris Snook <csnook@...hat.com>
--
diff -urp linux-2.6.20-git14.orig/drivers/net/e1000/e1000.h
linux-2.6.20-git14/drivers/net/e1000/e1000.h
--- linux-2.6.20-git14.orig/drivers/net/e1000/e1000.h	2007-02-19
14:32:15.000000000 -0500
+++ linux-2.6.20-git14/drivers/net/e1000/e1000.h	2007-02-19 15:07:37.000000000
-0500
@@ -252,7 +252,6 @@ 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 -urp linux-2.6.20-git14.orig/drivers/net/e1000/e1000_main.c
linux-2.6.20-git14/drivers/net/e1000/e1000_main.c
--- linux-2.6.20-git14.orig/drivers/net/e1000/e1000_main.c	2007-02-19
14:32:15.000000000 -0500
+++ linux-2.6.20-git14/drivers/net/e1000/e1000_main.c	2007-02-19
15:09:28.000000000 -0500
@@ -349,7 +349,6 @@ static void e1000_free_irq(struct e1000_
 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);
@@ -363,10 +362,8 @@ e1000_irq_disable(struct e1000_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
@@ -1336,7 +1333,6 @@ e1000_sw_init(struct e1000_adapter *adap
 	spin_lock_init(&adapter->tx_queue_lock);
 #endif

-	atomic_set(&adapter->irq_sem, 1);
 	spin_lock_init(&adapter->stats_lock);

 	set_bit(__E1000_DOWN, &adapter->flags);
@@ -3758,11 +3754,6 @@ 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
 	if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
 		hw->get_link_status = 1;
 		/* 80003ES2LAN workaround-- For packet buffer work-around on
@@ -3832,13 +3823,6 @@ e1000_intr(int irq, void *data)
 	if (unlikely(hw->mac_type >= e1000_82571 &&
 	             !(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);
 #endif

 	if (unlikely(icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))) {
@@ -3862,7 +3846,6 @@ 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);
 	}
@@ -3888,7 +3871,6 @@ e1000_intr(int irq, void *data)
 	 * de-assertion state.
 	 */
 	if (hw->mac_type == e1000_82547 || hw->mac_type == e1000_82547_rev_2) {
-		atomic_inc(&adapter->irq_sem);
 		E1000_WRITE_REG(hw, IMC, ~0);
 	}

-
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