V4L/DVB (9516): cx18: Move DVB buffer transfer handling from irq handler to work_queue

cx18: Move DVB buffer transfer handling from irq handler to work_queue thread.
In order to properly lock the epu2cpu mailbox for driver to CX23418 commands,
the DVB/TS buffer handling needs to be moved from the IRQ handler and IRQ
context to a work queue.  This work_queue implmentation is strikingly similar
to the ivtv implementation - for better or worse.

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

1 files changed, 12 insertions, 6 deletions

diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index e721c01d217..bbdd5f25041 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -199,12 +199,15 @@ struct cx18_options {
 #define CX18_F_S_APPL_IO        8       /* this stream is used read/written by an application */
 
 /* per-cx18, i_flags */
-#define CX18_F_I_LOADED_FW      0       /* Loaded the firmware the first time */
-#define CX18_F_I_EOS            4       /* End of encoder stream reached */
-#define CX18_F_I_RADIO_USER     5       /* The radio tuner is selected */
-#define CX18_F_I_ENC_PAUSED     13      /* the encoder is paused */
-#define CX18_F_I_INITED         21      /* set after first open */
-#define CX18_F_I_FAILED         22      /* set if first open failed */
+#define CX18_F_I_LOADED_FW              0       /* Loaded firmware 1st time */
+#define CX18_F_I_EOS                    4       /* End of encoder stream */
+#define CX18_F_I_RADIO_USER             5       /* radio tuner is selected */
+#define CX18_F_I_ENC_PAUSED             13      /* the encoder is paused */
+#define CX18_F_I_HAVE_WORK              15      /* there is work to be done */
+#define CX18_F_I_WORK_HANDLER_DVB       18      /* work to be done for DVB */
+#define CX18_F_I_INITED                 21      /* set after first open */
+#define CX18_F_I_FAILED                 22      /* set if first open failed */
+#define CX18_F_I_WORK_INITED            23      /* worker thread initialized */
 
 /* These are the VBI types as they appear in the embedded VBI private packets. */
 #define CX18_SLICED_TYPE_TELETEXT_B     (1)
@@ -431,6 +434,9 @@ struct cx18 {
         /* when the current DMA is finished this queue is woken up */
         wait_queue_head_t dma_waitq;
 
+        struct workqueue_struct *work_queue;
+        struct work_struct work;
+
         /* i2c */
         struct i2c_adapter i2c_adap[2];
         struct i2c_algo_bit_data i2c_algo[2];