commit 5fd7ce2334028e79571afef911f938dd20715bc0
Author: Jeff Garzik
Date: Fri Oct 19 15:38:40 2007 -0400

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

drivers/char/ip2/ip2main.c | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)

5fd7ce2334028e79571afef911f938dd20715bc0
diff --git a/drivers/char/ip2/ip2main.c b/drivers/char/ip2/ip2main.c
index 150e1e3..e04e66c 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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