From b7cbc892532316f2abd880186301e57239a17f28 Mon Sep 17 00:00:00 2001
From: Hans Verkuil <hans.verkuil@cisco.com>
Date: Sun, 17 Jul 2016 13:02:44 -0300
Subject: [media] cec: poll should check if there is room in the tx queue

For POLLOUT poll only checked if the adapter was configured, not
if there was room in the transmit queue. Add that check.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/staging/media/cec/cec-api.c b/drivers/staging/media/cec/cec-api.c
index 559f650..7be7615 100644
--- a/drivers/staging/media/cec/cec-api.c
+++ b/drivers/staging/media/cec/cec-api.c
@@ -52,7 +52,8 @@ static unsigned int cec_poll(struct file *filp,
 	if (!devnode->registered)
 		return POLLERR | POLLHUP;
 	mutex_lock(&adap->lock);
-	if (adap->is_configured)
+	if (adap->is_configured &&
+	    adap->transmit_queue_sz < CEC_MAX_MSG_TX_QUEUE_SZ)
 		res |= POLLOUT | POLLWRNORM;
 	if (fh->queued_msgs)
 		res |= POLLIN | POLLRDNORM;
-- 
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