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authorHans Verkuil <hverkuil@xs4all.nl>2018-02-08 11:55:48 -0500
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2018-02-26 08:12:49 -0500
commit1b3963509a469c70b965c2211db4eb3427c4ef86 (patch)
tree838e498d3e1fdf9f3060ddee827634a6170c2196 /drivers/media/cec
parent47b934875b00fefe16a2b8a9daa88eb82be169a8 (diff)
downloadlinux-1b3963509a469c70b965c2211db4eb3427c4ef86.tar.bz2
media: cec: improve debugging
cec_transmit_msg_fh() first checked the message for errors, and only after the message was found to be valid did it log the message contents. However, that makes it hard to associate an error in the kernel log with the message since the message contents was never logged in that case. So swap the order: first log the message (once some very basic checks are done), and only after that check for errors. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/cec')
-rw-r--r--drivers/media/cec/cec-adap.c32
1 files changed, 17 insertions, 15 deletions
diff --git a/drivers/media/cec/cec-adap.c b/drivers/media/cec/cec-adap.c
index 768f7d70b55c..cf6dc3f3a17e 100644
--- a/drivers/media/cec/cec-adap.c
+++ b/drivers/media/cec/cec-adap.c
@@ -699,16 +699,31 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
else
msg->flags = 0;
+ 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;
+ }
+
/* Sanity checks */
if (msg->len == 0 || msg->len > CEC_MAX_MSG_SIZE) {
dprintk(1, "%s: invalid length %d\n", __func__, msg->len);
return -EINVAL;
}
+
+ memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
+
+ if (msg->timeout)
+ dprintk(2, "%s: %*ph (wait for 0x%02x%s)\n",
+ __func__, msg->len, msg->msg, msg->reply,
+ !block ? ", nb" : "");
+ else
+ dprintk(2, "%s: %*ph%s\n",
+ __func__, msg->len, msg->msg, !block ? " (nb)" : "");
+
if (msg->timeout && msg->len == 1) {
- dprintk(1, "%s: can't reply for poll msg\n", __func__);
+ dprintk(1, "%s: can't reply to poll msg\n", __func__);
return -EINVAL;
}
- memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
if (msg->len == 1) {
if (cec_msg_destination(msg) == 0xf) {
dprintk(1, "%s: invalid poll message\n", __func__);
@@ -768,19 +783,6 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
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;
- }
-
- if (msg->timeout)
- dprintk(2, "%s: %*ph (wait for 0x%02x%s)\n",
- __func__, msg->len, msg->msg, msg->reply,
- !block ? ", nb" : "");
- else
- dprintk(2, "%s: %*ph%s\n",
- __func__, msg->len, msg->msg, !block ? " (nb)" : "");
-
data->msg = *msg;
data->fh = fh;
data->adap = adap;