From: Mike McCormack <mikem@ring3k.org>
Date: Mon, 30 May 2011 23:50:07 +0000 (+0900)
Subject: rtlwifi: Use write barrier when assigning ownership
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=71352b2318675cf6a3f54c02a33d91ac17af1626;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

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 ac95dc44374..2492cc234c0 100644
--- 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: