Jason-ch Chen <jason-ch.chen@xxxxxxxxxxxx>
> Sent: Wednesday, September 29, 2021 5:53 PM
[...]
> Hi Hayes,
>
> Sometimes Rx submits rapidly and the USB kernel driver of opensource
> cannot receive any disconnect event due to CPU heavy loading, which
> finally causes a system crash.
> Do you have any suggestions to modify the r8152 driver to prevent this
> situation happened?
Do you mind to try the following patch?
It avoids to re-submit RX immediately.
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 60ba9b734055..bfe00af8283f 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -767,6 +767,7 @@ enum rtl8152_flags {
PHY_RESET,
SCHEDULE_TASKLET,
GREEN_ETHERNET,
+ SCHEDULE_NAPI,
};
#define DEVICE_ID_THINKPAD_THUNDERBOLT3_DOCK_GEN2 0x3082
@@ -1770,6 +1771,14 @@ static void read_bulk_callback(struct urb *urb)
rtl_set_unplug(tp);
netif_device_detach(tp->netdev);
return;
+ case -EPROTO:
+ urb->actual_length = 0;
+ spin_lock_irqsave(&tp->rx_lock, flags);
+ list_add_tail(&agg->list, &tp->rx_done);
+ spin_unlock_irqrestore(&tp->rx_lock, flags);
+ set_bit(SCHEDULE_NAPI, &tp->flags);
+ schedule_delayed_work(&tp->schedule, 1);
+ return;
case -ENOENT:
return; /* the urb is in unlink state */
case -ETIME:
@@ -2425,6 +2434,7 @@ static int rx_bottom(struct r8152 *tp, int budget)
if (list_empty(&tp->rx_done))
goto out1;
+ clear_bit(SCHEDULE_NAPI, &tp->flags);
INIT_LIST_HEAD(&rx_queue);
spin_lock_irqsave(&tp->rx_lock, flags);
list_splice_init(&tp->rx_done, &rx_queue);
@@ -2441,7 +2451,7 @@ static int rx_bottom(struct r8152 *tp, int budget)
agg = list_entry(cursor, struct rx_agg, list);
urb = agg->urb;
- if (urb->actual_length < ETH_ZLEN)
+ if (urb->status != 0 || urb->actual_length < ETH_ZLEN)
goto submit;
agg_free = rtl_get_free_rx(tp, GFP_ATOMIC);
@@ -6643,6 +6653,10 @@ static void rtl_work_func_t(struct work_struct *work)
netif_carrier_ok(tp->netdev))
tasklet_schedule(&tp->tx_tl);
+ if (test_and_clear_bit(SCHEDULE_NAPI, &tp->flags) &&
+ !list_empty(&tp->rx_done))
+ napi_schedule(&tp->napi);
+
mutex_unlock(&tp->control);
out1:
Best Regards,
Hayes
