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r8152: prevent the driver from transmitting packets with carrier off 

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>
This commit is contained in:
hayeswang 2017-03-23 19:14:19 +08:00 committed by David S. Miller
parent 49d52e8108
commit 2f25abe6ba
1 changed files with 16 additions and 2 deletions
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18
drivers/net/usb/r8152.c
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@ -1294,6 +1294,7 @@ static void intr_callback(struct urb *urb)
}
} 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);
}
@ -3169,6 +3170,9 @@ 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)) {
@ -3702,8 +3706,18 @@ static int rtl8152_resume(struct usb_interface *intf)
tp->rtl_ops.autosuspend_en(tp, false);
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);
clear_bit(SELECTIVE_SUSPEND, &tp->flags);
smp_mb__after_atomic();