netdev - Re: [PATCH v2] sh_eth: unmap DMA buffers when freeing rings

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Date:   Wed, 19 Apr 2017 22:09:51 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     David Miller <davem@...hat.com>
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        horms@...ge.net.au
Subject: Re: [PATCH v2] sh_eth: unmap DMA buffers when freeing rings

On 04/17/2017 11:10 PM, David Miller wrote:

>> The DMA API debugging (when enabled) causes:
>>
>> WARNING: CPU: 0 PID: 1445 at lib/dma-debug.c:519 add_dma_entry+0xe0/0x12c
>> DMA-API: exceeded 7 overlapping mappings of cacheline 0x01b2974d
>>
>> to be  printed after repeated initialization of the Ether device, e.g.
>> suspend/resume or 'ifconfig' up/down. This is because DMA buffers mapped
>> using dma_map_single() in sh_eth_ring_format() and sh_eth_start_xmit() are
>> never unmapped. Resolve this problem by unmapping the buffers when freeing
>> the descriptor  rings;  in order  to do it right, we'd have to add an extra
>> parameter to sh_eth_txfree() (we rename this function to sh_eth_tx_free(),
>> while at it).
>>
>> Based on the commit a47b70ea86bd ("ravb: unmap descriptors when freeing
>> rings").
>>
>> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
>
> Applied, thanks.

    Please don;t forget to send it to -stable.
    The bug seems to be there from the very beginning.

MBR, Sergei