From 2dd5bed59356e03610bebe1a37c397788df50b9b Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Tue, 30 Nov 2010 08:25:05 +0100 Subject: firewire: ohci: optimize iso context checks in the interrupt handler When the isochRx/isochTx bit is clear, we do not need to read the corresponding iso interrupt event register. Signed-off-by: Clemens Ladisch Signed-off-by: Stefan Richter --- drivers/firewire/ohci.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-) (limited to 'drivers/firewire') diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 29259f3a30bb..01b3bc9154a6 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -1813,22 +1813,28 @@ static irqreturn_t irq_handler(int irq, void *data) if (event & OHCI1394_respTxComplete) tasklet_schedule(&ohci->at_response_ctx.tasklet); - iso_event = reg_read(ohci, OHCI1394_IsoRecvIntEventClear); - reg_write(ohci, OHCI1394_IsoRecvIntEventClear, iso_event); - - while (iso_event) { - i = ffs(iso_event) - 1; - tasklet_schedule(&ohci->ir_context_list[i].context.tasklet); - iso_event &= ~(1 << i); + if (event & OHCI1394_isochRx) { + iso_event = reg_read(ohci, OHCI1394_IsoRecvIntEventClear); + reg_write(ohci, OHCI1394_IsoRecvIntEventClear, iso_event); + + while (iso_event) { + i = ffs(iso_event) - 1; + tasklet_schedule( + &ohci->ir_context_list[i].context.tasklet); + iso_event &= ~(1 << i); + } } - iso_event = reg_read(ohci, OHCI1394_IsoXmitIntEventClear); - reg_write(ohci, OHCI1394_IsoXmitIntEventClear, iso_event); + if (event & OHCI1394_isochTx) { + iso_event = reg_read(ohci, OHCI1394_IsoXmitIntEventClear); + reg_write(ohci, OHCI1394_IsoXmitIntEventClear, iso_event); - while (iso_event) { - i = ffs(iso_event) - 1; - tasklet_schedule(&ohci->it_context_list[i].context.tasklet); - iso_event &= ~(1 << i); + while (iso_event) { + i = ffs(iso_event) - 1; + tasklet_schedule( + &ohci->it_context_list[i].context.tasklet); + iso_event &= ~(1 << i); + } } if (unlikely(event & OHCI1394_regAccessFail)) -- cgit v1.2.3-58-ga151