Index: uspace/drv/bus/isa/isa.c
===================================================================
--- uspace/drv/bus/isa/isa.c	(revision a25d893614487642d506ae1156dca0202b72dd8e)
+++ uspace/drv/bus/isa/isa.c	(revision 94e46c9512c28256bc6e96c5263cba46b43dc8c0)
@@ -245,5 +245,6 @@
 	bool opened = false;
 	int fd;
-	size_t len = 0;
+	size_t len;
+	ssize_t r;
 
 	fd = open(conf_path, O_RDONLY);
@@ -269,5 +270,6 @@
 	}
 
-	if (0 >= read(fd, buf, len)) {
+	r = read_all(fd, buf, len);
+	if (r < 0) {
 		ddf_msg(LVL_ERROR, "Unable to read file '%s'.", conf_path);
 		goto cleanup;