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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Tsang-Shian Lin <thlin@realtek.com>,
        Ping-Ke Shih <pkshih@realtek.com>,
        Larry Finger <Larry.Finger@lwfinger.net>,
        Yan-Hsuan Chuang <yhchuang@realtek.com>,
        Birming Chiu <birming@realtek.com>,
        Shaofu <shaofu@realtek.com>,
        Steven Ting <steventing@realtek.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.4 77/97] rtlwifi: rtl_pci: Fix the bug when inactiveps is enabled.
Date:   Fri, 23 Mar 2018 10:55:04 +0100
Message-Id: <20180323094201.888502382@linuxfoundation.org>
In-Reply-To: <20180323094157.535925724@linuxfoundation.org>
References: <20180323094157.535925724@linuxfoundation.org>
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4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tsang-Shian Lin <thlin@realtek.com>


[ Upstream commit b7573a0a27bfa8270dea9b145448f6884b7cacc1 ]

Reset the driver current tx read/write index to zero when inactiveps
nic out of sync with HW state. Wrong driver tx read/write index will
cause Tx fail.

Signed-off-by: Tsang-Shian Lin <thlin@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Yan-Hsuan Chuang <yhchuang@realtek.com>
Cc: Birming Chiu <birming@realtek.com>
Cc: Shaofu <shaofu@realtek.com>
Cc: Steven Ting <steventing@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/realtek/rtlwifi/pci.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -1572,7 +1572,14 @@ int rtl_pci_reset_trx_ring(struct ieee80
 				dev_kfree_skb_irq(skb);
 				ring->idx = (ring->idx + 1) % ring->entries;
 			}
+
+			if (rtlpriv->use_new_trx_flow) {
+				rtlpci->tx_ring[i].cur_tx_rp = 0;
+				rtlpci->tx_ring[i].cur_tx_wp = 0;
+			}
+
 			ring->idx = 0;
+			ring->entries = rtlpci->txringcount[i];
 		}
 	}
 	spin_unlock_irqrestore(&rtlpriv->locks.irq_th_lock, flags);