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authorClemens Ladisch <clemens@ladisch.de>2010-11-30 10:25:05 +0300
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-12-13 22:39:14 +0300
commit2dd5bed59356e03610bebe1a37c397788df50b9b (patch)
treec1d069389a923d3b33ead320003e39d19ee86975 /drivers
parent5b06db166c4d38638980283505259fa165d4f369 (diff)
downloadlinux-2dd5bed59356e03610bebe1a37c397788df50b9b.tar.xz
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 <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/firewire/ohci.c32
1 files changed, 19 insertions, 13 deletions
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))