--- zzzz-none-000/linux-3.10.107/drivers/isdn/hysdn/hysdn_proclog.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/isdn/hysdn/hysdn_proclog.c	2021-02-04 17:41:59.000000000 +0000
@@ -175,14 +175,15 @@
 	int len;
 	hysdn_card *card = PDE_DATA(file_inode(file));
 
-	if (!*((struct log_data **) file->private_data)) {
+	if (!(inf = *((struct log_data **) file->private_data))) {
 		struct procdata *pd = card->proclog;
 		if (file->f_flags & O_NONBLOCK)
 			return (-EAGAIN);
 
-		interruptible_sleep_on(&(pd->rd_queue));
+		wait_event_interruptible(pd->rd_queue, (inf =
+				*((struct log_data **) file->private_data)));
 	}
-	if (!(inf = *((struct log_data **) file->private_data)))
+	if (!inf)
 		return (0);
 
 	inf->usage_cnt--;	/* new usage count */