Patch "r8152: prevent the driver from transmitting packets with carrier off" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    r8152: prevent the driver from transmitting packets with carrier off

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     r8152-prevent-the-driver-from-transmitting-packets-with-carrier-off.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Dec 21 10:35:49 CET 2017
From: hayeswang <hayeswang@realtek.com>
Date: Thu, 23 Mar 2017 19:14:19 +0800
Subject: r8152: prevent the driver from transmitting packets with carrier off

From: hayeswang <hayeswang@realtek.com>


[ Upstream commit 2f25abe6bac573928a990ccbdac75873add8127e ]

The linking status may be changed when autosuspend. And, after
autoresume, the driver may try to transmit packets when the device
is carrier off, because the interrupt transfer doesn't update the
linking status, yet. And, if the device is in ALDPS mode, the device
would stop working.

The another similar case is
 1. unplug the cable.
 2. interrupt transfer queue a work_queue for linking change.
 3. device enters the ALDPS mode.
 4. a tx occurs before the work_queue is called.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/usb/r8152.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -1207,6 +1207,7 @@ static void intr_callback(struct urb *ur
 		}
 	} else {
 		if (netif_carrier_ok(tp->netdev)) {
+			netif_stop_queue(tp->netdev);
 			set_bit(RTL8152_LINK_CHG, &tp->flags);
 			schedule_delayed_work(&tp->schedule, 0);
 		}
@@ -3001,6 +3002,9 @@ static void set_carrier(struct r8152 *tp
 			napi_enable(&tp->napi);
 			netif_wake_queue(netdev);
 			netif_info(tp, link, netdev, "carrier on\n");
+		} else if (netif_queue_stopped(netdev) &&
+			   skb_queue_len(&tp->tx_queue) < tp->tx_qlen) {
+			netif_wake_queue(netdev);
 		}
 	} else {
 		if (netif_carrier_ok(netdev)) {
@@ -3561,8 +3565,18 @@ static int rtl8152_resume(struct usb_int
 			clear_bit(SELECTIVE_SUSPEND, &tp->flags);
 			napi_disable(&tp->napi);
 			set_bit(WORK_ENABLE, &tp->flags);
-			if (netif_carrier_ok(tp->netdev))
-				rtl_start_rx(tp);
+
+			if (netif_carrier_ok(tp->netdev)) {
+				if (rtl8152_get_speed(tp) & LINK_STATUS) {
+					rtl_start_rx(tp);
+				} else {
+					netif_carrier_off(tp->netdev);
+					tp->rtl_ops.disable(tp);
+					netif_info(tp, link, tp->netdev,
+						   "linking down\n");
+				}
+			}
+
 			napi_enable(&tp->napi);
 		} else {
 			tp->rtl_ops.up(tp);


Patches currently in stable-queue which might be from hayeswang@realtek.com are

queue-4.4/r8152-fix-the-list-rx_done-may-be-used-without-initialization.patch
queue-4.4/r8152-prevent-the-driver-from-transmitting-packets-with-carrier-off.patch