linux-kernel - Re: [PATCH v11 3/7] iio: core: Add new DMABUF interface infrastructure

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Message-ID: <fc3045c5-d542-4a6c-906d-84f72e776e9c@web.de>
Date: Wed, 19 Jun 2024 13:43:33 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Paul Cercueil <paul@...pouillou.net>, Nuno Sá
 <nuno.sa@...log.com>, linux-iio@...r.kernel.org, dmaengine@...r.kernel.org,
 linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 linaro-mm-sig@...ts.linaro.org, Christian König
 <christian.koenig@....com>, Jonathan Cameron <jic23@...nel.org>,
 Lars-Peter Clausen <lars@...afoo.de>, Sumit Semwal
 <sumit.semwal@...aro.org>, Vinod Koul <vkoul@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, linux-doc@...r.kernel.org,
 Jonathan Corbet <corbet@....net>, Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v11 3/7] iio: core: Add new DMABUF interface
 infrastructure

…
> +++ b/drivers/iio/industrialio-buffer.c
…
> +static void iio_buffer_dmabuf_release(struct kref *ref)
> +{
…
> +	dma_resv_lock(dmabuf->resv, NULL);
> +	dma_buf_unmap_attachment(attach, priv->sgt, priv->dir);
> +	dma_resv_unlock(dmabuf->resv);
…

Under which circumstances will another lock guard become applicable?
https://elixir.bootlin.com/linux/v6.10-rc4/source/include/linux/cleanup.h#L179

Regards,
Markus