linux-kernel - Re: [PATCH V2] crypto: ccp - Release dma channels before dmaengine unrgister

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Date:   Thu, 1 Sep 2022 21:57:02 +0800
From:   Koba Ko <koba.ko@...onical.com>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     John Allen <john.allen@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] crypto: ccp - Release dma channels before dmaengine unrgister

On Thu, Sep 1, 2022 at 9:42 PM Tom Lendacky <thomas.lendacky@....com> wrote:
>
> On 8/31/22 21:16, Koba Ko wrote:
> > A warning is shown during shutdown,
> >
> > __dma_async_device_channel_unregister called while 2 clients hold a reference
> > WARNING: CPU: 15 PID: 1 at drivers/dma/dmaengine.c:1110 __dma_async_device_channel_unregister+0xb7/0xc0
> >
> > Call dma_release_channel for occupied channles before dma_async_device_unregister.
> >
> > Fixes: 4cbe9bc34ed0 ("crypto: ccp - ccp_dmaengine_unregister release dma channels")
>
> I can't find this Fixes: tag. I did find:
>
> 54cce8ecb925 ("crypto: ccp - ccp_dmaengine_unregister release dma channels")
>
> Not sure if Herbert can take care of that or if you'll need a v3.

Sorry, it should be 54cce8ecb925("crypto: ccp -
ccp_dmaengine_unregister release dma channels")

>
> With the change to the Fixes: tag
>
> Acked-by: Tom Lendacky <thomas.lendacky@....com>
>
> > Reported-by: kernel test robot <lkp@...el.com>
> > Signed-off-by: Koba Ko <koba.ko@...onical.com>
> > ---
> > V2: Fix the unused warning
> > ---
> >   drivers/crypto/ccp/ccp-dmaengine.c | 6 +++++-
> >   1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/crypto/ccp/ccp-dmaengine.c b/drivers/crypto/ccp/ccp-dmaengine.c
> > index 7d4b4ad1db1f3..9f753cb4f5f18 100644
> > --- a/drivers/crypto/ccp/ccp-dmaengine.c
> > +++ b/drivers/crypto/ccp/ccp-dmaengine.c
> > @@ -641,6 +641,10 @@ static void ccp_dma_release(struct ccp_device *ccp)
> >       for (i = 0; i < ccp->cmd_q_count; i++) {
> >               chan = ccp->ccp_dma_chan + i;
> >               dma_chan = &chan->dma_chan;
> > +
> > +             if (dma_chan->client_count)
> > +                     dma_release_channel(dma_chan);
> > +
> >               tasklet_kill(&chan->cleanup_tasklet);
> >               list_del_rcu(&dma_chan->device_node);
> >       }
> > @@ -766,8 +770,8 @@ void ccp_dmaengine_unregister(struct ccp_device *ccp)
> >       if (!dmaengine)
> >               return;
> >
> > -     dma_async_device_unregister(dma_dev);
> >       ccp_dma_release(ccp);
> > +     dma_async_device_unregister(dma_dev);
> >
> >       kmem_cache_destroy(ccp->dma_desc_cache);
> >       kmem_cache_destroy(ccp->dma_cmd_cache);