linux-kernel - Re: [PATCH v7 05/28] dma-heap: Add proper kref handling on dma-buf heaps

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Message-ID: <2f5e5e81-21e1-421d-94ac-e4507b323680@web.de>
Date: Sat, 20 Jul 2024 17:13:40 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: John Stultz <jstultz@...gle.com>, "T. J. Mercier" <tjmercier@...gle.com>,
 Yong Wu <yong.wu@...iatek.com>, Yunfei Dong <yunfei.dong@...iatek.com>,
 Project_Global_Chrome_Upstream_Group@...iatek.com,
 linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 Angelo Gioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Benjamin Gaignard <benjamin.gaignard@...labora.com>,
 Hans Verkuil <hverkuil-cisco@...all.nl>,
 Jeffrey Kardatzke <jkardatzke@...gle.com>,
 Marek Szyprowski <m.szyprowski@...sung.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Nathan Hebert <nhebert@...omium.org>,
 Nicolas Dufresne <nicolas.dufresne@...labora.com>,
 Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 Sebastian Fricke <sebastian.fricke@...labora.com>,
 Tomasz Figa <tfiga@...omium.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Brian Starkey
 <Brian.Starkey@....com>, Chen-Yu Tsai <wenst@...omium.org>,
 Christian König <christian.koenig@....com>,
 Daniel Vetter <daniel@...ll.ch>, Fritz König
 <frkoenig@...omium.org>, Hsin-yi Wang <hsinyi@...omium.org>,
 Matthias Brugger <matthias.bgg@...il.com>, Steve Cho
 <stevecho@...omium.org>, Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [PATCH v7 05/28] dma-heap: Add proper kref handling on dma-buf
 heaps

…
> +++ b/drivers/dma-buf/dma-heap.c
…
> +static void dma_heap_release(struct kref *ref)
> +{
…
> +	mutex_lock(&heap_list_lock);
> +	list_del(&heap->list);
> +	mutex_unlock(&heap_list_lock);
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&heap_list_lock);”?
https://elixir.bootlin.com/linux/v6.10/source/include/linux/mutex.h#L196

Regards,
Markus