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-rw-r--r--include/media/cec.h19
1 files changed, 14 insertions, 5 deletions
diff --git a/include/media/cec.h b/include/media/cec.h
index 9a791c08a789..dc7854b855f3 100644
--- a/include/media/cec.h
+++ b/include/media/cec.h
@@ -126,12 +126,20 @@ struct cec_adap_ops {
* With a transfer rate of at most 36 bytes per second this makes 18 messages
* per second worst case.
*
- * We queue at most 3 seconds worth of messages. The CEC specification requires
- * that messages are replied to within a second, so 3 seconds should give more
- * than enough margin. Since most messages are actually more than 2 bytes, this
- * is in practice a lot more than 3 seconds.
+ * We queue at most 3 seconds worth of received messages. The CEC specification
+ * requires that messages are replied to within a second, so 3 seconds should
+ * give more than enough margin. Since most messages are actually more than 2
+ * bytes, this is in practice a lot more than 3 seconds.
*/
-#define CEC_MAX_MSG_QUEUE_SZ (18 * 3)
+#define CEC_MAX_MSG_RX_QUEUE_SZ (18 * 3)
+
+/*
+ * The transmit queue is limited to 1 second worth of messages (worst case).
+ * Messages can be transmitted by userspace and kernel space. But for both it
+ * makes no sense to have a lot of messages queued up. One second seems
+ * reasonable.
+ */
+#define CEC_MAX_MSG_TX_QUEUE_SZ (18 * 1)
struct cec_adapter {
struct module *owner;
@@ -141,6 +149,7 @@ struct cec_adapter {
struct rc_dev *rc;
struct list_head transmit_queue;
+ unsigned int transmit_queue_sz;
struct list_head wait_queue;
struct cec_data *transmitting;