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media: cec-adap.c: add 'unregistered' checks 

Make the code a bit more robust by checking if the adapter has
been unregistered at the start of cec_transmit_msg_fh() and
cec_received_msg_ts(). If it is unregistered, then just return.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2020-09-08 12:26:11 +02:00 committed by Mauro Carvalho Chehab
parent 5254187cfa
commit 2d307380ef
1 changed files with 6 additions and 0 deletions
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6
drivers/media/cec/core/cec-adap.c
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@ -751,6 +751,9 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
struct cec_data *data;
bool is_raw = msg_is_raw(msg);
if (adap->devnode.unregistered)
return -ENODEV;
msg->rx_ts = 0;
msg->tx_ts = 0;
msg->rx_status = 0;
@ -1049,6 +1052,9 @@ void cec_received_msg_ts(struct cec_adapter *adap,
if (WARN_ON(!msg->len || msg->len > CEC_MAX_MSG_SIZE))
return;
if (adap->devnode.unregistered)
return;
/*
* Some CEC adapters will receive the messages that they transmitted.
* This test filters out those messages by checking if we are the