diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 7cfa99fbbb62..4f21a21a1fd5 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -853,9 +853,8 @@ static ssize_t iterate_tty_read(struct tty_ldisc *ld, struct tty_struct *tty,
 	size_t copied, count = iov_iter_count(to);
 
 	do {
-		ssize_t size;
+		ssize_t size = min(count, sizeof(kernel_buf));
 
-		size = count > sizeof(kernel_buf) ? sizeof(kernel_buf) : count;
 		size = ld->ops->read(tty, file, kernel_buf, size, &cookie, offset);
 		if (!size)
 			break;