linux-kernel - Re: [PATCH v3 07/11] iio: core: Add new DMABUF interface infrastructure

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Date:   Tue, 4 Apr 2023 06:22:50 -0700
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Paul Cercueil <paul@...pouillou.net>,
        Nuno Sá <noname.nuno@...il.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        dmaengine@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v3 07/11] iio: core: Add new DMABUF interface
 infrastructure

On 4/4/23 00:55, Paul Cercueil wrote:
> [...]
>>> +       priv = attach->importer_priv;
>>> +       list_del_init(&priv->entry);
>>> +
>>> +       iio_buffer_dmabuf_put(attach);
>>> +       iio_buffer_dmabuf_put(attach);
>>> +
>> Is this intended? Looks suspicious...
> It is intended, yes. You want to release the dma_buf_attachment that's
> created in iio_buffer_attach_dmabuf(), and you need to call
> iio_buffer_find_attachment() to get a pointer to it, which also gets a
> second reference - so it needs to unref twice.
Let's add a comment documenting that.