V4L/DVB (9593): cx18: Add outgoing mailbox mutexes and check for ack via waitq vs poll

Add mutexes to ensure exclusive access for outgoing driver to CX23418 mailboxes.
Also wait on a waitq for mailbox acknowledgement from the CX23418 instead of
polling.

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

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index 04f1c624da7c..e2ec15549783 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -378,7 +378,10 @@ struct cx18 {
         u32 v4l2_cap;           /* V4L2 capabilities of card */
         u32 hw_flags;           /* Hardware description of the board */
         unsigned mdl_offset;
-        struct cx18_scb __iomem *scb;   /* pointer to SCB */
+        struct cx18_scb __iomem *scb; /* pointer to SCB */
+        struct mutex epu2apu_mb_lock; /* protect driver to chip mailbox in SCB*/
+        struct mutex epu2cpu_mb_lock; /* protect driver to chip mailbox in SCB*/
+
 
         struct cx18_av_state av_state;
 
@@ -428,8 +431,6 @@ struct cx18 {
 
         wait_queue_head_t mb_apu_waitq;
         wait_queue_head_t mb_cpu_waitq;
-        wait_queue_head_t mb_epu_waitq;
-        wait_queue_head_t mb_hpu_waitq;
         wait_queue_head_t cap_w;
         /* when the current DMA is finished this queue is woken up */
         wait_queue_head_t dma_waitq;