usb: Use static const, consolidate code

Using static const generally increases object text and decreases data size.
It also generally decreases overall object size.

Consolidate duplicated code into new fix_crc_bug function
and declare data in that function static const.

Signed-off-by: Joe Perches <[e-mail]>

drivers/net/usb/hso.c

···
 	}
 }
 
+static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
+{
+	static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
+	u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
+
+	if (((rest == 5) || (rest == 6)) &&
+	    !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
+		    crc_check, 4)) {
+		urb->actual_length -= 4;
+	}
+}
+
 /* Moving data from usb to kernel (in interrupt state) */
 static void read_bulk_callback(struct urb *urb)
 {
···
 		return;
 	}
 
-	if (odev->parent->port_spec & HSO_INFO_CRC_BUG) {
-		u32 rest;
-		u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
-		rest = urb->actual_length %
-			le16_to_cpu(odev->in_endp->wMaxPacketSize);
-		if (((rest == 5) || (rest == 6)) &&
-		    !memcmp(((u8 *) urb->transfer_buffer) +
-			    urb->actual_length - 4, crc_check, 4)) {
-			urb->actual_length -= 4;
-		}
-	}
+	if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
+		fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
 
 	/* do we even have a packet? */
 	if (urb->actual_length) {
···
 		return;
 
 	if (status == 0) {
-		if (serial->parent->port_spec & HSO_INFO_CRC_BUG) {
-			u32 rest;
-			u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
-			rest =
-			    urb->actual_length %
-			    le16_to_cpu(serial->in_endp->wMaxPacketSize);
-			if (((rest == 5) || (rest == 6)) &&
-			    !memcmp(((u8 *) urb->transfer_buffer) +
-				    urb->actual_length - 4, crc_check, 4)) {
-				urb->actual_length -= 4;
-			}
-		}
+		if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
+			fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
 		/* Valid data, handle RX data */
 		spin_lock(&serial->serial_lock);
 		serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;