linux-kernel - Re: [PATCH V3] crypto: ccp - Release dma channels before dmaengine unrgister

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Date:   Fri, 9 Sep 2022 17:08:21 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Koba Ko <koba.ko@...onical.com>
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        John Allen <john.allen@....com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] crypto: ccp - Release dma channels before dmaengine
 unrgister

On Thu, Sep 01, 2022 at 10:47:12PM +0800, 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: 54cce8ecb925 ("crypto: ccp - ccp_dmaengine_unregister release dma channels")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Koba Ko <koba.ko@...onical.com>
> Acked-by: Tom Lendacky <thomas.lendacky@....com>
> 
> ---
> V2: Fix the unused warning
> V3: Fix the Fixes: tag.
> ---
>  drivers/crypto/ccp/ccp-dmaengine.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)

Patch applied.  Thanks. 
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt