V4L/DVB (9725): cx18: Remove unnecessary MMIO accesses in time critical irq handling path

Remove unnecessary MMIO accesses in time critical irq handling path.  Also
ensured that the mailbox ack field is read in last, so we know for sure if we
have a stale mailbox or not on receipt.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index 02a82c3b7a32..cad352aeb837 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -446,6 +446,10 @@ struct cx18 {
         /* when the current DMA is finished this queue is woken up */
         wait_queue_head_t dma_waitq;
 
+        u32 sw1_irq_mask;
+        u32 sw2_irq_mask;
+        u32 hw2_irq_mask;
+
         struct cx18_epu_work_order epu_work_order[CX18_MAX_EPU_WORK_ORDERS];
         char epu_debug_str[256]; /* CX18_EPU_DEBUG is rare: use shared space */