diff -r 57c666b8ef50 linux/drivers/media/dvb/dvb-usb/af9015.c
--- a/linux/drivers/media/dvb/dvb-usb/af9015.c	Wed Aug 26 08:34:16 2009 +0200
+++ b/linux/drivers/media/dvb/dvb-usb/af9015.c	Wed Aug 26 20:23:07 2009 +0200
@@ -108,7 +108,7 @@
 	}
 
 	/* write requested */
-	if (write) {
+	if (write && req->data_len) {
 		memcpy(&buf[8], req->data, req->data_len);
 		msg_len += req->data_len;
 	}