netdev - Re: [EXT] Re: [PATCH/RFC v2 net-next] ravb: unmap descriptors when freeing rings

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Date:   Thu, 12 Jan 2017 17:55:29 +0100
From:   Lino Sanfilippo <lsanfil@...vell.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Simon Horman <horms@...ge.net.au>
CC:     David Miller <davem@...emloft.net>,
        Magnus Damm <magnus.damm@...il.com>, <netdev@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>
Subject: Re: [EXT] Re: [PATCH/RFC v2 net-next] ravb: unmap descriptors when
 freeing rings

Hi,

On 12.01.2017 17:37, Sergei Shtylyov wrote:
> External Email
>
> ----------------------------------------------------------------------
> On 01/12/2017 04:23 PM, Lino Sanfilippo wrote:
>
>>>>> +
>>>>> +    for (; priv->cur_tx[q] - priv->dirty_tx[q] > 0; priv->dirty_tx[q]++) {
>>
>> BTW: How can this work correctly when cur_tx wraps and dirty_tx is greater?
>
>    {cur|dirty}_tx never wrap.
>

Both values are 32 bit and AFAICS they are only incremented (and never reset or
decremented).
So what prevents them from wrapping every 2^32 processed tx descriptors? Am I missing
something?

Regards,
Lino