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

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Date:   Wed, 25 Jan 2017 17:48:57 +0100
From:   Simon Horman <horms@...ge.net.au>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
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 Wed, Jan 25, 2017 at 07:18:15PM +0300, Sergei Shtylyov wrote:
> 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?

Sure, I will check.

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

Thanks for noticing, I'll fix that.

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