Subject: Re: [PATCH] net: 8390: Fix possible data races in __ei_get_stats

From: Jia-Ju Bai <[email-masked]>
Date: Tue, 8 May 2018 14:47:38 +0800

On 2018/5/8 13:04, Eric Dumazet wrote:
>
> On 05/07/2018 07:16 PM, Jia-Ju Bai wrote:
>
>> Yes, "&dev->stats" will not change, because it is a fixed address.
>> But the field data in "dev->stats" is changed (rx_frame_errors, rx_crc_errors and rx_missed_errors).
>> So if the driver returns "&dev->stats" without lock protection (like on line 858), the field data value of this return value can be the changed field data value or unchanged field data value.
>
> We do not care.
>
> This function can be called by multiple cpus at the same time.
>
> As soon as one cpu returns from it, another cpu can happily modify dev->stats.ANYFIELD.
>
> Your patch fixes nothing at all.
>

Okay, thanks.
I also find that my patch does not work...

Best wishes,
Jia-Ju Bai