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| author | Clemens Ladisch <clemens@ladisch.de> | 2010-11-30 08:25:05 +0100 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2010-12-13 20:39:14 +0100 |
| commit | 2dd5bed59356e03610bebe1a37c397788df50b9b (patch) | |
| tree | c1d069389a923d3b33ead320003e39d19ee86975 /drivers/firewire | |
| parent | 5b06db166c4d38638980283505259fa165d4f369 (diff) | |
| download | linux-2dd5bed59356e03610bebe1a37c397788df50b9b.tar.gz linux-2dd5bed59356e03610bebe1a37c397788df50b9b.tar.bz2 linux-2dd5bed59356e03610bebe1a37c397788df50b9b.zip | |
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/firewire')
| -rw-r--r-- | drivers/firewire/ohci.c | 32 |
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)) |