rtlwifi: Use write barrier when assigning ownership

Make sure all updates to a descriptor are flushed to memory
before assigning ownship to hardware.

Signed-off-by: Mike McCormack <mikem@ring3k.org>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/rtlwifi/rtl8192ce/trx.c b/drivers/net/wireless/rtlwifi/rtl8192ce/trx.c
index ac95dc4..2492cc2 100644 (file)
--- a/drivers/net/wireless/rtlwifi/rtl8192ce/trx.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192ce/trx.c
@@ -930,6 +930,7 @@ void rtl92ce_set_desc(u8 *pdesc, bool istx, u8 desc_name, u8 *val)
        if (istx == true) {
                switch (desc_name) {
                case HW_DESC_OWN:
+                       wmb();
                        SET_TX_DESC_OWN(pdesc, 1);
                        break;
                case HW_DESC_TX_NEXTDESC_ADDR:
@@ -943,6 +944,7 @@ void rtl92ce_set_desc(u8 *pdesc, bool istx, u8 desc_name, u8 *val)
        } else {
                switch (desc_name) {
                case HW_DESC_RXOWN:
+                       wmb();
                        SET_RX_DESC_OWN(pdesc, 1);
                        break;
                case HW_DESC_RXBUFF_ADDR: