linux-kernel - Re: [PATCH net-next 1/3] net: macb: queue tie-off or disable during WOL suspend

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Date: Thu, 15 Feb 2024 12:19:56 +0200
From: claudiu beznea <claudiu.beznea@...on.dev>
To: "Karumanchi, Vineeth" <vineeth.karumanchi@....com>,
 nicolas.ferre@...rochip.com, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, linux@...linux.org.uk
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, git@....com
Subject: Re: [PATCH net-next 1/3] net: macb: queue tie-off or disable during
 WOL suspend

Hi, Vineeth,

On 15.02.2024 07:43, Karumanchi, Vineeth wrote:
> Hi Claudiu,
> 
> On 2/3/2024 9:08 PM, claudiu beznea wrote:
> <...>
>>>           queue->tx_skb = NULL;
>>> @@ -2568,6 +2574,16 @@ static int macb_alloc_consistent(struct macb *bp)
>>>       if (bp->macbgem_ops.mog_alloc_rx_buffers(bp))
>>>           goto out_err;
>>>   +    /* Required for tie off descriptor for PM cases */
>>> +    if (!(bp->caps & MACB_CAPS_QUEUE_DISABLE)) {
>>> +        bp->rx_ring_tieoff = dma_alloc_coherent(&bp->pdev->dev,
>>> +                            macb_dma_desc_get_size(bp),
>>> +                            &bp->rx_ring_tieoff_dma,
>>> +                            GFP_KERNEL);
>>> +        if (!bp->rx_ring_tieoff)
>>> +            goto out_err;
>> You also need to free the previously allocated rx buffers.
> 
> Are you referring to (bp->macbgem_ops.mog_alloc_rx_buffers(bp)) allocation ?
> It was freed in macb_free_consistent():
>              ...
>              bp->macbgem_ops.mog_free_rx_buffers(bp);
>              ...

You're right, my bad.

> 
> Please let me know if you are referring to different buffers.

I was referring to bp->macbgem_ops.mog_alloc_rx_buffers but hat is covered
as you pointed out.

Thank you,
Claudiu Beznea