[media] nova-t-usb2: don't do DMA on stack

The USB control messages require DMA to work. We cannot pass
a stack-allocated buffer, as it is not warranted that the
stack would be into a DMA enabled area.
Reviewed-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/dvb-usb/nova-t-usb2.c

@@ -74,22 +74,29 @@ static struct rc_map_table rc_map_haupp_table[] = {
  */
 static int nova_t_rc_query(struct dvb_usb_device *d, u32 *event, int *state)
 {
-	u8 key[5],cmd[2] = { DIBUSB_REQ_POLL_REMOTE, 0x35 }, data,toggle,custom;
+	u8 *buf, data, toggle, custom;
 	u16 raw;
 	int i;
 	struct dibusb_device_state *st = d->priv;
 
-	dvb_usb_generic_rw(d,cmd,2,key,5,0);
+	buf = kmalloc(5, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	buf[0] = DIBUSB_REQ_POLL_REMOTE;
+	buf[1] = 0x35;
+	dvb_usb_generic_rw(d, buf, 2, buf, 5, 0);
 
 	*state = REMOTE_NO_KEY_PRESSED;
-	switch (key[0]) {
+	switch (buf[0]) {
 		case DIBUSB_RC_HAUPPAUGE_KEY_PRESSED:
-			raw = ((key[1] << 8) | key[2]) >> 3;
+			raw = ((buf[1] << 8) | buf[2]) >> 3;
 			toggle = !!(raw & 0x800);
 			data = raw & 0x3f;
 			custom = (raw >> 6) & 0x1f;
 
-			deb_rc("raw key code 0x%02x, 0x%02x, 0x%02x to c: %02x d: %02x toggle: %d\n",key[1],key[2],key[3],custom,data,toggle);
+			deb_rc("raw key code 0x%02x, 0x%02x, 0x%02x to c: %02x d: %02x toggle: %d\n",
+			       buf[1], buf[2], buf[3], custom, data, toggle);
 
 			for (i = 0; i < ARRAY_SIZE(rc_map_haupp_table); i++) {
 				if (rc5_data(&rc_map_haupp_table[i]) == data &&
@@ -117,6 +124,7 @@ static int nova_t_rc_query(struct dvb_usb_device *d, u32 *event, int *state)
 			break;
 	}
 
+	kfree(buf);
 	return 0;
 }