ASoC: SOF: sof-client-dma-trace: Block the dtrace if the firmware has crashed

Do not allow the dma trace to be started if the firmware is in crashed
state.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Author: ujfalusi

sound/soc/sof/sof-client-dma-trace.c

@@ -293,8 +293,12 @@ static size_t sof_wait_trace_avail(struct sof_client_dev *cdev,
 
 static int sof_dfsentry_trace_open(struct inode *inode, struct file *file)
 {
+	struct sof_client_dev *cdev = inode->i_private;
 	int ret;
 
+	if (sof_client_get_fw_state(cdev) == SOF_FW_CRASHED)
+		return -ENODEV;
+
 	ret = debugfs_file_get(file->f_path.dentry);
 	if (unlikely(ret))
 		return ret;