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[media] cec: poll should check if there is room in the tx queue

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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>
This commit is contained in:
Hans Verkuil 2016-07-17 13:02:44 -03:00 committed by Mauro Carvalho Chehab
parent 83505028d8
commit b7cbc89253
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/media/cec/cec-api.c
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@ -52,7 +52,8 @@ static unsigned int cec_poll(struct file *filp,
if (!devnode->registered) if (!devnode->registered)
return POLLERR | POLLHUP; return POLLERR | POLLHUP;
mutex_lock(&adap->lock); 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; res |= POLLOUT | POLLWRNORM;
if (fh->queued_msgs) if (fh->queued_msgs)
res |= POLLIN | POLLRDNORM; res |= POLLIN | POLLRDNORM;