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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>
This commit is contained in:
Jeff Garzik 2007-10-19 15:38:40 -04:00
parent f3518e4ee7
commit 6bd3bd6794
1 changed files with 20 additions and 7 deletions
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27
drivers/char/ip2/ip2main.c
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@ -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 );