rtlwifi: Assign rx buffer ownership to hardware last

Ownership of an rx buffer should only be given to the hardware
after all other changes are written, otherwise there's
a potential race.
Signed-off-by: NMike McCormack <mikem@ring3k.org>
Signed-off-by: NLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rtlwifi/pci.c

@@ -784,8 +784,6 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw)
 		rtlpriv->cfg->ops->set_desc((u8 *) pdesc, false,
 					    HW_DESC_RXBUFF_ADDR,
 					    (u8 *)&bufferaddress);
-		rtlpriv->cfg->ops->set_desc((u8 *)pdesc, false, HW_DESC_RXOWN,
-					    (u8 *)&tmp_one);
 		rtlpriv->cfg->ops->set_desc((u8 *)pdesc, false,
 					    HW_DESC_RXPKT_LEN,
 					    (u8 *)&rtlpci->rxbuffersize);
@@ -795,6 +793,9 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw)
 						    HW_DESC_RXERO,
 						    (u8 *)&tmp_one);
 
+		rtlpriv->cfg->ops->set_desc((u8 *)pdesc, false, HW_DESC_RXOWN,
+					    (u8 *)&tmp_one);
+
 		index = (index + 1) % rtlpci->rxringcount;
 	}