linux-kernel - [PATCH 5.4 018/408] r8169: fix data corruption issue on RTL8402

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Date:   Tue, 27 Oct 2020 14:49:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Petr Tesarik <ptesarik@...e.cz>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: [PATCH 5.4 018/408] r8169: fix data corruption issue on RTL8402

From: Heiner Kallweit <hkallweit1@...il.com>

[ Upstream commit ef9da46ddef071e1bbb943afbbe9b38771855554 ]

Petr reported that after resume from suspend RTL8402 partially
truncates incoming packets, and re-initializing register RxConfig
before the actual chip re-initialization sequence is needed to avoid
the issue.

Reported-by: Petr Tesarik <ptesarik@...e.cz>
Proposed-by: Petr Tesarik <ptesarik@...e.cz>
Tested-by: Petr Tesarik <ptesarik@...e.cz>
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/realtek/r8169_main.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -5514,6 +5514,10 @@ static int rtl8169_change_mtu(struct net
 	dev->mtu = new_mtu;
 	netdev_update_features(dev);
 
+	/* Reportedly at least Asus X453MA truncates packets otherwise */
+	if (tp->mac_version == RTL_GIGA_MAC_VER_37)
+		rtl_init_rxcfg(tp);
+
 	return 0;
 }