From 5111dd3e422d08435164fc6d405d849ff6421eec Mon Sep 17 00:00:00 2001 From: Larry Finger Date: Mon, 23 May 2011 20:37:31 -0500 Subject: [PATCH] rtlwifi: rtl8192se: Use write barrier when assigning ownership As noted by Mike McCormack for rtl8192ce, make sure all updates to a descriptor are flushed to memory before assigning ownship to hardware. Signed-off-by: Larry Finger Signed-off-by: John W. Linville --- drivers/net/wireless/rtlwifi/rtl8192se/trx.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/rtlwifi/rtl8192se/trx.c b/drivers/net/wireless/rtlwifi/rtl8192se/trx.c index 14a8b7866c0..d509cf6a1e4 100644 --- a/drivers/net/wireless/rtlwifi/rtl8192se/trx.c +++ b/drivers/net/wireless/rtlwifi/rtl8192se/trx.c @@ -873,6 +873,7 @@ void rtl92se_tx_fill_cmddesc(struct ieee80211_hw *hw, u8 *pdesc, SET_TX_DESC_TX_BUFFER_SIZE(pdesc, (u16)(skb->len)); SET_TX_DESC_TX_BUFFER_ADDRESS(pdesc, cpu_to_le32(mapping)); + wmb(); SET_TX_DESC_OWN(pdesc, 1); } else { /* H2C Command Desc format (Host TXCMD) */ /* 92SE must set as 1 for firmware download HW DMA error */ @@ -891,6 +892,7 @@ void rtl92se_tx_fill_cmddesc(struct ieee80211_hw *hw, u8 *pdesc, SET_TX_DESC_TX_BUFFER_SIZE(pdesc, (u16)(skb->len)); SET_TX_DESC_TX_BUFFER_ADDRESS(pdesc, cpu_to_le32(mapping)); + wmb(); SET_TX_DESC_OWN(pdesc, 1); } @@ -901,6 +903,7 @@ void rtl92se_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: @@ -914,6 +917,7 @@ void rtl92se_set_desc(u8 *pdesc, bool istx, u8 desc_name, u8 *val) } else { switch (desc_name) { case HW_DESC_RXOWN: + wmb(); SET_RX_STATUS_DESC_OWN(pdesc, 1); break; case HW_DESC_RXBUFF_ADDR: -- 2.41.0