ASoC: SOF: ipc: Drop header parameter from sof_ipc_tx_message_unlocked()

The snd_sof_ipc_msg.header is not used by platform code, there is no need
to update it and the 'header' parameter for sof_ipc_tx_message_unlocked()
can be dropped at the same time.

Instead of using the header parameter passed by the caller (which does by
setting it to the hdr->cmd) use the hdr->cmd directly when logging.

At the same time make sure that there is a message passed to the tx_message
function.
All instances of the tx_message passes an IPC message, this check is placed
to make sure the future users can not introduce bugs.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220128133620.9411-3-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/ipc.c

@@ -294,14 +294,20 @@ static int tx_wait_done(struct snd_sof_ipc *ipc, struct snd_sof_ipc_msg *msg,
 }
 
 /* send IPC message from host to DSP */
-static int sof_ipc_tx_message_unlocked(struct snd_sof_ipc *ipc, u32 header,
+static int sof_ipc_tx_message_unlocked(struct snd_sof_ipc *ipc,
 				       void *msg_data, size_t msg_bytes,
 				       void *reply_data, size_t reply_bytes)
 {
+	struct sof_ipc_cmd_hdr *hdr = msg_data;
 	struct snd_sof_dev *sdev = ipc->sdev;
 	struct snd_sof_ipc_msg *msg;
 	int ret;
 
+	if (!msg_data || msg_bytes < sizeof(*hdr)) {
+		dev_err_ratelimited(sdev->dev, "No IPC message to send\n");
+		return -EINVAL;
+	}
+
 	if (ipc->disable_ipc_tx || sdev->fw_state != SOF_FW_BOOT_COMPLETE)
 		return -ENODEV;
 
@@ -314,15 +320,13 @@ static int sof_ipc_tx_message_unlocked(struct snd_sof_ipc *ipc, u32 header,
 	/* initialise the message */
 	msg = &ipc->msg;
 
-	msg->header = header;
+	/* attach message data */
+	memcpy(msg->msg_data, msg_data, msg_bytes);
 	msg->msg_size = msg_bytes;
+
 	msg->reply_size = reply_bytes;
 	msg->reply_error = 0;
 
-	/* attach any data */
-	if (msg_bytes)
-		memcpy(msg->msg_data, msg_data, msg_bytes);
-
 	sdev->msg = msg;
 
 	ret = snd_sof_dsp_send_msg(sdev, msg);
@@ -339,7 +343,7 @@ static int sof_ipc_tx_message_unlocked(struct snd_sof_ipc *ipc, u32 header,
 		return ret;
 	}
 
-	ipc_log_header(sdev->dev, "ipc tx", msg->header);
+	ipc_log_header(sdev->dev, "ipc tx", hdr->cmd);
 
 	/* now wait for completion */
 	return tx_wait_done(ipc, msg, reply_data);
@@ -385,7 +389,7 @@ int sof_ipc_tx_message_no_pm(struct snd_sof_ipc *ipc, u32 header,
 	/* Serialise IPC TX */
 	mutex_lock(&ipc->tx_mutex);
 
-	ret = sof_ipc_tx_message_unlocked(ipc, header, msg_data, msg_bytes,
+	ret = sof_ipc_tx_message_unlocked(ipc, msg_data, msg_bytes,
 					  reply_data, reply_bytes);
 
 	mutex_unlock(&ipc->tx_mutex);
@@ -789,7 +793,6 @@ static int sof_set_get_large_ctrl_data(struct snd_sof_dev *sdev,
 			memcpy(sparams->dst, sparams->src + offset, send_bytes);
 
 		err = sof_ipc_tx_message_unlocked(sdev->ipc,
-						  partdata->rhdr.hdr.cmd,
 						  partdata,
 						  partdata->rhdr.hdr.size,
 						  partdata,