[media] rc: do not wake up rc thread unless there is something to do
The TechnoTrend USB IR Receiver sends 125 ISO URBs per second, even when
there is no IR activity. Reduce the number of wake ups from the other
drivers too.
This saves about 0.25ms/s on a 2.4GHz Core 2 according to powertop.
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/rc/iguanair.c b/drivers/media/rc/iguanair.c
index 6a09c2e..66ba237 100644
--- a/drivers/media/rc/iguanair.c
+++ b/drivers/media/rc/iguanair.c
@@ -134,6 +134,7 @@
} else if (len >= 7) {
DEFINE_IR_RAW_EVENT(rawir);
unsigned i;
+ bool event = false;
init_ir_raw_event(&rawir);
@@ -147,10 +148,12 @@
RX_RESOLUTION;
}
- ir_raw_event_store_with_filter(ir->rc, &rawir);
+ if (ir_raw_event_store_with_filter(ir->rc, &rawir))
+ event = true;
}
- ir_raw_event_handle(ir->rc);
+ if (event)
+ ir_raw_event_handle(ir->rc);
}
}