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media: cec: only increase the seqnr if CEC_TRANSMIT would return 0 

The transmit code would increase the sequence number first thing, even though
CEC_TRANSMIT would return an error due to a malformatted cec_msg struct later
on.

While valid behavior, this had the disadvantage of producing holes in the
sequence list that made debugging harder.

Only increase the sequence number when the whole message is validated.
When debugging (i.e. with cec-ctl -M) the sequence numbering is now nicely
increasing by 1 per message.

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 2017-07-06 11:09:52 -03:00 committed by Mauro Carvalho Chehab
parent 299708e45e
commit 15e809e961
1 changed files with 8 additions and 3 deletions
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11
drivers/media/cec/cec-adap.c
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@ -630,9 +630,7 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
msg->tx_nack_cnt = 0;
msg->tx_low_drive_cnt = 0;
msg->tx_error_cnt = 0;
msg->sequence = ++adap->sequence;
if (!msg->sequence)
msg->sequence = ++adap->sequence;
msg->sequence = 0;
if (msg->reply && msg->timeout == 0) {
/* Make sure the timeout isn't 0. */
@ -671,6 +669,9 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
msg->tx_status = CEC_TX_STATUS_NACK |
CEC_TX_STATUS_MAX_RETRIES;
msg->tx_nack_cnt = 1;
msg->sequence = ++adap->sequence;
if (!msg->sequence)
msg->sequence = ++adap->sequence;
return 0;
}
}
@ -705,6 +706,10 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
if (!data)
return -ENOMEM;
msg->sequence = ++adap->sequence;
if (!msg->sequence)
msg->sequence = ++adap->sequence;
if (msg->len > 1 && msg->msg[1] == CEC_MSG_CDC_MESSAGE) {
msg->msg[2] = adap->phys_addr >> 8;
msg->msg[3] = adap->phys_addr & 0xff;