[PATCH 04/13] IR: fix locking in ir_raw_event_work

[Maxim Levitsky <maximlevitsky@gmail.com>]

It is prefectly possible to have ir_raw_event_work
running concurently on two cpus, thus we must protect
it from that situation.

Maybe better solution is to ditch the workqueue at all
and use good 'ol thread per receiver, and just wake it up...

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
---
 drivers/media/IR/ir-raw-event.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c
index 9d5c029..4098748 100644
--- a/drivers/media/IR/ir-raw-event.c
+++ b/drivers/media/IR/ir-raw-event.c
@@ -40,13 +40,16 @@ static void ir_raw_event_work(struct work_struct *work)
 	struct ir_raw_event_ctrl *raw =
 		container_of(work, struct ir_raw_event_ctrl, rx_work);
 
+	mutex_lock(&ir_raw_handler_lock);
+
 	while (kfifo_out(&raw->kfifo, &ev, sizeof(ev)) == sizeof(ev)) {
-		mutex_lock(&ir_raw_handler_lock);
 		list_for_each_entry(handler, &ir_raw_handler_list, list)
 			handler->decode(raw->input_dev, ev);
-		mutex_unlock(&ir_raw_handler_lock);
 		raw->prev_ev = ev;
 	}
+
+	mutex_unlock(&ir_raw_handler_lock);
+
 }
 
 /**
-- 
1.7.0.4