--- zzzz-none-000/linux-3.10.107/drivers/media/pci/bt8xx/dst_ca.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/media/pci/bt8xx/dst_ca.c	2021-02-04 17:41:59.000000000 +0000
@@ -320,29 +320,27 @@
 	if (copy_from_user(p_ca_message, arg, sizeof (struct ca_msg)))
 		return -EFAULT;
 
-	if (p_ca_message->msg) {
-		dprintk(verbose, DST_CA_NOTICE, 1, " Message = [%*ph]",
-			3, p_ca_message->msg);
-
-		for (i = 0; i < 3; i++) {
-			command = command | p_ca_message->msg[i];
-			if (i < 2)
-				command = command << 8;
-		}
-		dprintk(verbose, DST_CA_NOTICE, 1, " Command=[0x%x]", command);
-
-		switch (command) {
-		case CA_APP_INFO:
-			memcpy(p_ca_message->msg, state->messages, 128);
-			if (copy_to_user(arg, p_ca_message, sizeof (struct ca_msg)) )
-				return -EFAULT;
-			break;
-		case CA_INFO:
-			memcpy(p_ca_message->msg, state->messages, 128);
-			if (copy_to_user(arg, p_ca_message, sizeof (struct ca_msg)) )
-				return -EFAULT;
-			break;
-		}
+	dprintk(verbose, DST_CA_NOTICE, 1, " Message = [%*ph]",
+		3, p_ca_message->msg);
+
+	for (i = 0; i < 3; i++) {
+		command = command | p_ca_message->msg[i];
+		if (i < 2)
+			command = command << 8;
+	}
+	dprintk(verbose, DST_CA_NOTICE, 1, " Command=[0x%x]", command);
+
+	switch (command) {
+	case CA_APP_INFO:
+		memcpy(p_ca_message->msg, state->messages, 128);
+		if (copy_to_user(arg, p_ca_message, sizeof (struct ca_msg)) )
+			return -EFAULT;
+		break;
+	case CA_INFO:
+		memcpy(p_ca_message->msg, state->messages, 128);
+		if (copy_to_user(arg, p_ca_message, sizeof (struct ca_msg)) )
+			return -EFAULT;
+		break;
 	}
 
 	return 0;
@@ -494,60 +492,58 @@
 		goto free_mem_and_exit;
 	}
 
+	/*	EN50221 tag	*/
+	command = 0;
+
+	for (i = 0; i < 3; i++) {
+		command = command | p_ca_message->msg[i];
+		if (i < 2)
+			command = command << 8;
+	}
+	dprintk(verbose, DST_CA_DEBUG, 1, " Command=[0x%x]\n", command);
+
+	switch (command) {
+	case CA_PMT:
+		dprintk(verbose, DST_CA_DEBUG, 1, "Command = SEND_CA_PMT");
+		if ((ca_set_pmt(state, p_ca_message, hw_buffer, 0, 0)) < 0) {	// code simplification started
+			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_PMT Failed !");
+			result = -1;
+			goto free_mem_and_exit;
+		}
+		dprintk(verbose, DST_CA_INFO, 1, " -->CA_PMT Success !");
+		break;
+	case CA_PMT_REPLY:
+		dprintk(verbose, DST_CA_INFO, 1, "Command = CA_PMT_REPLY");
+		/*      Have to handle the 2 basic types of cards here  */
+		if ((dst_check_ca_pmt(state, p_ca_message, hw_buffer)) < 0) {
+			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_PMT_REPLY Failed !");
+			result = -1;
+			goto free_mem_and_exit;
+		}
+		dprintk(verbose, DST_CA_INFO, 1, " -->CA_PMT_REPLY Success !");
+		break;
+	case CA_APP_INFO_ENQUIRY:		// only for debugging
+		dprintk(verbose, DST_CA_INFO, 1, " Getting Cam Application information");
+
+		if ((ca_get_app_info(state)) < 0) {
+			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_APP_INFO_ENQUIRY Failed !");
+			result = -1;
+			goto free_mem_and_exit;
+		}
+		dprintk(verbose, DST_CA_INFO, 1, " -->CA_APP_INFO_ENQUIRY Success !");
+		break;
+	case CA_INFO_ENQUIRY:
+		dprintk(verbose, DST_CA_INFO, 1, " Getting CA Information");
 
-	if (p_ca_message->msg) {
-		/*	EN50221 tag	*/
-		command = 0;
-
-		for (i = 0; i < 3; i++) {
-			command = command | p_ca_message->msg[i];
-			if (i < 2)
-				command = command << 8;
-		}
-		dprintk(verbose, DST_CA_DEBUG, 1, " Command=[0x%x]\n", command);
-
-		switch (command) {
-		case CA_PMT:
-			dprintk(verbose, DST_CA_DEBUG, 1, "Command = SEND_CA_PMT");
-			if ((ca_set_pmt(state, p_ca_message, hw_buffer, 0, 0)) < 0) {	// code simplification started
-				dprintk(verbose, DST_CA_ERROR, 1, " -->CA_PMT Failed !");
-				result = -1;
-				goto free_mem_and_exit;
-			}
-			dprintk(verbose, DST_CA_INFO, 1, " -->CA_PMT Success !");
-			break;
-		case CA_PMT_REPLY:
-			dprintk(verbose, DST_CA_INFO, 1, "Command = CA_PMT_REPLY");
-			/*      Have to handle the 2 basic types of cards here  */
-			if ((dst_check_ca_pmt(state, p_ca_message, hw_buffer)) < 0) {
-				dprintk(verbose, DST_CA_ERROR, 1, " -->CA_PMT_REPLY Failed !");
-				result = -1;
-				goto free_mem_and_exit;
-			}
-			dprintk(verbose, DST_CA_INFO, 1, " -->CA_PMT_REPLY Success !");
-			break;
-		case CA_APP_INFO_ENQUIRY:		// only for debugging
-			dprintk(verbose, DST_CA_INFO, 1, " Getting Cam Application information");
-
-			if ((ca_get_app_info(state)) < 0) {
-				dprintk(verbose, DST_CA_ERROR, 1, " -->CA_APP_INFO_ENQUIRY Failed !");
-				result = -1;
-				goto free_mem_and_exit;
-			}
-			dprintk(verbose, DST_CA_INFO, 1, " -->CA_APP_INFO_ENQUIRY Success !");
-			break;
-		case CA_INFO_ENQUIRY:
-			dprintk(verbose, DST_CA_INFO, 1, " Getting CA Information");
-
-			if ((ca_get_ca_info(state)) < 0) {
-				dprintk(verbose, DST_CA_ERROR, 1, " -->CA_INFO_ENQUIRY Failed !");
-				result = -1;
-				goto free_mem_and_exit;
-			}
-			dprintk(verbose, DST_CA_INFO, 1, " -->CA_INFO_ENQUIRY Success !");
-			break;
+		if ((ca_get_ca_info(state)) < 0) {
+			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_INFO_ENQUIRY Failed !");
+			result = -1;
+			goto free_mem_and_exit;
 		}
+		dprintk(verbose, DST_CA_INFO, 1, " -->CA_INFO_ENQUIRY Success !");
+		break;
 	}
+
 free_mem_and_exit:
 	kfree (hw_buffer);
 
@@ -674,11 +670,9 @@
 
 static ssize_t dst_ca_read(struct file *file, char __user *buffer, size_t length, loff_t *offset)
 {
-	ssize_t bytes_read = 0;
-
 	dprintk(verbose, DST_CA_DEBUG, 1, " Device read.");
 
-	return bytes_read;
+	return 0;
 }
 
 static ssize_t dst_ca_write(struct file *file, const char __user *buffer, size_t length, loff_t *offset)