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authorHayes Wang <hayeswang@realtek.com>2019-11-22 16:21:09 +0800
committerDavid S. Miller <davem@davemloft.net>2019-11-22 10:07:44 -0800
commit5b1d9c17a3e0c16e1c9adf9c8a89f2735cb6dff8 (patch)
treee3e2eb7b94cf7be4ec0886ca20fe4b125e2ed991
parent068299374cc4ef9a1990adda2d66c4afcacd5277 (diff)
downloadlinux-stericsson-5b1d9c17a3e0c16e1c9adf9c8a89f2735cb6dff8.tar.gz
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 84811412464d ("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>
-rw-r--r--drivers/net/usb/r8152.c28
1 files changed, 20 insertions, 8 deletions
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 4d34c01826f3..b2507c59ba8b 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -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;