netdev - Re: [PATCH/RFC v3 net] ravb: unmap descriptors when freeing rings

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Message-ID: <312867f0-f6dd-3c92-df09-fae72ea7405b@cogentembedded.com>
Date:   Wed, 25 Jan 2017 19:18:15 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Simon Horman <horms+renesas@...ge.net.au>
Cc:     Magnus Damm <magnus.damm@...il.com>, netdev@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH/RFC v3 net] ravb: unmap descriptors when freeing rings

On 01/24/2017 09:21 PM, Simon Horman wrote:

> From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
>
> "swiotlb buffer is full" errors occur after repeated initialisation of a
> device - f.e. suspend/resume or ip link set up/down. This is because memory
> mapped using dma_map_single() in ravb_ring_format() and ravb_start_xmit()
> is not released.  Resolve this problem by unmapping descriptors when
> freeing rings.

    Could you look into the sh_eth driver which seems to have the same issue?

> Note, ravb_tx_free() is moved but not otherwise modified by this patch.

    This is not true anymore BTW.

> Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
> [simon: reworked]
> Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>

MBR, Sergei