[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 559f6500d114f1370199dc52b4bef0fae6b916fc..7be7615a0fdf0e865b3d0433d731f8d1089efe0d 100644 (file)
--- 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;