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r8152: avoid to call napi_disable twice 

Call napi_disable() twice would cause dead lock. There are three situations
may result in the issue.

1. rtl8152_pre_reset() and set_carrier() are run at the same time.
2. Call rtl8152_set_tunable() after rtl8152_close().
3. Call rtl8152_set_ringparam() after rtl8152_close().

For #1, use the same solution as commit 8481141246 ("r8152: Re-order
napi_disable in rtl8152_close"). For #2 and #3, add checking the flag
of IFF_UP and using napi_disable/napi_enable during mutex.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hayes Wang 2019-11-22 16:21:09 +08:00 committed by David S. Miller
parent 068299374c
commit 5b1d9c17a3
1 changed files with 20 additions and 8 deletions
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28
drivers/net/usb/r8152.c
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@ -4552,10 +4552,10 @@ static int rtl8152_pre_reset(struct usb_interface *intf)
netif_stop_queue(netdev);
tasklet_disable(&tp->tx_tl);
napi_disable(&tp->napi);
clear_bit(WORK_ENABLE, &tp->flags);
usb_kill_urb(tp->intr_urb);
cancel_delayed_work_sync(&tp->schedule);
napi_disable(&tp->napi);
if (netif_carrier_ok(netdev)) {
mutex_lock(&tp->control);
tp->rtl_ops.disable(tp);
@ -4673,7 +4673,7 @@ static int rtl8152_system_resume(struct r8152 *tp)
netif_device_attach(netdev);
if (netif_running(netdev) && netdev->flags & IFF_UP) {
if (netif_running(netdev) && (netdev->flags & IFF_UP)) {
tp->rtl_ops.up(tp);
netif_carrier_off(netdev);
set_bit(WORK_ENABLE, &tp->flags);
@ -5244,9 +5244,15 @@ static int rtl8152_set_tunable(struct net_device *netdev,
}
if (tp->rx_copybreak != val) {
napi_disable(&tp->napi);
tp->rx_copybreak = val;
napi_enable(&tp->napi);
if (netdev->flags & IFF_UP) {
mutex_lock(&tp->control);
napi_disable(&tp->napi);
tp->rx_copybreak = val;
napi_enable(&tp->napi);
mutex_unlock(&tp->control);
} else {
tp->rx_copybreak = val;
}
}
break;
default:
@ -5274,9 +5280,15 @@ static int rtl8152_set_ringparam(struct net_device *netdev,
return -EINVAL;
if (tp->rx_pending != ring->rx_pending) {
napi_disable(&tp->napi);
tp->rx_pending = ring->rx_pending;
napi_enable(&tp->napi);
if (netdev->flags & IFF_UP) {
mutex_lock(&tp->control);
napi_disable(&tp->napi);
tp->rx_pending = ring->rx_pending;
napi_enable(&tp->napi);
mutex_unlock(&tp->control);
} else {
tp->rx_pending = ring->rx_pending;
}
}
return 0;