linux-kernel - Re: [PATCH net-next 1/7] r8152: adjust rx

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Date:	Mon, 19 Jan 2015 16:13:33 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	sfeldma@...il.com
Cc:	hayeswang@...ltek.com, netdev@...r.kernel.org,
	nic_swsd@...ltek.com, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH net-next 1/7] r8152: adjust rx_bottom

From: Scott Feldman <sfeldma@...il.com>
Date: Mon, 19 Jan 2015 00:03:42 -0800

> On Sun, Jan 18, 2015 at 11:13 PM, Hayes Wang <hayeswang@...ltek.com> wrote:
>> @@ -1746,7 +1746,18 @@ find_next_rx:
>>                 }
>>
>>  submit:
>> -               r8152_submit_rx(tp, agg, GFP_ATOMIC);
>> +               if (!ret) {
>> +                       ret = r8152_submit_rx(tp, agg, GFP_ATOMIC);
>> +               } else {
>> +                       urb->actual_length = 0;
>> +                       list_add_tail(&agg->list, next);
> 
> Do you need a spin_lock_irqsave(&tp->rx_lock, flags) around this?

Indeed, and rtl_start_rx() seems to also access agg->list without
proper locking.
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