From 6bd3bd6794d4139aa1b5193a82e3adfcb488c392 Mon Sep 17 00:00:00 2001
From: Jeff Garzik
Date: Fri, 19 Oct 2007 15:38:40 -0400
Subject: drivers/char/ip2: separate polling and irq-driven work entry points

Polling currently calls the irq handler, which loops through all the
boards, calling the work function for all polling boards with work.

irq handling loops through all the boards, finding the specific board
that applies to us, and calling the work just for that one board.

The two logics are sufficiently different to warrant different
functions, rather than being slack and calling the same function in two
different ways.

This serves to make the interrupt handler a -lot- more efficient.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---
 drivers/char/ip2/ip2main.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

(limited to 'drivers')

diff --git a/drivers/char/ip2/ip2main.c b/drivers/char/ip2/ip2main.c
index 150e1e364ca7..e04e66cf2c68 100644
--- a/drivers/char/ip2/ip2main.c
+++ b/drivers/char/ip2/ip2main.c
@@ -752,7 +752,7 @@ retry:
 					continue;
 				rc = request_irq( ip2config.irq[i], ip2_interrupt,
 					IP2_SA_FLAGS | (ip2config.type[i] == PCI ? IRQF_SHARED : 0),
-					pcName, (void *)&pcName);
+					pcName, i2BoardPtrTable[i]);
 				if (rc) {
 					printk(KERN_ERR "IP2: an request_irq failed: error %d\n",rc);
 					ip2config.irq[i] = CIR_POLL;
@@ -1191,12 +1191,12 @@ ip2_irq_work(i2eBordStrPtr pB)
 #endif /* USE_IQI */
 }
 
-static irqreturn_t
-ip2_interrupt(int irq, void *dev_id)
+static void
+ip2_polled_interrupt(void)
 {
 	int i;
 	i2eBordStrPtr  pB;
-	int handled = 0;
+	const int irq = 0;
 
 	ip2trace (ITRC_NO_PORT, ITRC_INTR, 99, 1, irq );
 
@@ -1208,7 +1208,6 @@ ip2_interrupt(int irq, void *dev_id)
 //			IRQ = 0 for polled boards, we won't poll "IRQ" boards
 
 		if ( pB && (pB->i2eUsingIrq == irq) ) {
-			handled = 1;
 			ip2_irq_work(pB);
 		}
 	}
@@ -1216,7 +1215,21 @@ ip2_interrupt(int irq, void *dev_id)
 	++irq_counter;
 
 	ip2trace (ITRC_NO_PORT, ITRC_INTR, ITRC_RETURN, 0 );
-	return IRQ_RETVAL(handled);
+}
+
+static irqreturn_t
+ip2_interrupt(int irq, void *dev_id)
+{
+	i2eBordStrPtr pB = dev_id;
+
+	ip2trace (ITRC_NO_PORT, ITRC_INTR, 99, 1, pB->i2eUsingIrq );
+
+	ip2_irq_work(pB);
+
+	++irq_counter;
+
+	ip2trace (ITRC_NO_PORT, ITRC_INTR, ITRC_RETURN, 0 );
+	return IRQ_HANDLED;
 }
 
 /******************************************************************************/
@@ -1239,7 +1252,7 @@ ip2_poll(unsigned long arg)
 	// Just polled boards, IRQ = 0 will hit all non-interrupt boards.
 	// It will NOT poll boards handled by hard interrupts.
 	// The issue of queued BH interrups is handled in ip2_interrupt().
-	ip2_interrupt(0, NULL);
+	ip2_polled_interrupt();
 
 	PollTimer.expires = POLL_TIMEOUT;
 	add_timer( &PollTimer );
-- 
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