linux-kernel - Re: [RFC PATCH v3 04/12] netdev: support binding dma-buf to netdevice

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Message-ID: <1fee982f-1e96-4ae8-ede0-7e57bf84c5f7@huawei.com>
Date:   Tue, 7 Nov 2023 15:46:04 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Mina Almasry <almasrymina@...gle.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <linaro-mm-sig@...ts.linaro.org>
CC:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        David Ahern <dsahern@...nel.org>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Jeroen de Borst <jeroendb@...gle.com>,
        Praveen Kaligineedi <pkaligineedi@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [RFC PATCH v3 04/12] netdev: support binding dma-buf to netdevice

On 2023/11/6 10:44, Mina Almasry wrote:
> +
> +void __netdev_devmem_binding_free(struct netdev_dmabuf_binding *binding)
> +{
> +	size_t size, avail;
> +
> +	gen_pool_for_each_chunk(binding->chunk_pool,
> +				netdev_devmem_free_chunk_owner, NULL);
> +
> +	size = gen_pool_size(binding->chunk_pool);
> +	avail = gen_pool_avail(binding->chunk_pool);
> +
> +	if (!WARN(size != avail, "can't destroy genpool. size=%lu, avail=%lu",
> +		  size, avail))
> +		gen_pool_destroy(binding->chunk_pool);


Is there any other place calling the gen_pool_destroy() when the above
warning is triggered? Do we have a leaking for binding->chunk_pool?

> +
> +	dma_buf_unmap_attachment(binding->attachment, binding->sgt,
> +				 DMA_BIDIRECTIONAL);
> +	dma_buf_detach(binding->dmabuf, binding->attachment);
> +	dma_buf_put(binding->dmabuf);
> +	kfree(binding);
> +}
> +