linux-kernel - Re: [PATCH v3] media: add virtio-media driver

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Message-ID: <d4ec6adf-02db-4937-a483-5655f70aa205@web.de>
Date: Sat, 12 Apr 2025 16:27:59 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Alexandre Courbot <gnurou@...il.com>, linux-media@...r.kernel.org,
 virtualization@...ts.linux.dev
Cc: Alexandre Courbot <acourbot@...gle.com>,
 LKML <linux-kernel@...r.kernel.org>, Albert Esteve <aesteve@...hat.com>,
 Alistair Delva <adelva@...gle.com>, Changyeon Jo <changyeon@...gle.com>,
 Daniel Almeida <daniel.almeida@...labora.com>,
 Eugenio Pérez <eperezma@...hat.com>,
 Gurchetan Singh <gurchetansingh@...gle.com>,
 Hans Verkuil <hverkuil@...all.nl>, Jason Wang <jasowang@...hat.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 "Michael S. Tsirkin" <mst@...hat.com>,
 Nicolas Dufresne <nicolas.dufresne@...labora.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: Re: [PATCH v3] media: add virtio-media driver

…
> +++ b/drivers/media/virtio/virtio_media_driver.c
> @@ -0,0 +1,959 @@
…
> +static struct virtio_media_session *
> +virtio_media_session_alloc(struct virtio_media *vv, u32 id,
> +			   bool nonblocking_dequeue)
> +{
…
> +	init_waitqueue_head(&session->dqbuf_wait);
> +
> +	mutex_lock(&vv->sessions_lock);
> +	list_add_tail(&session->list, &vv->sessions);
> +	mutex_unlock(&vv->sessions_lock);
> +
> +	return session;
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&vv->sessions_lock);”?
https://elixir.bootlin.com/linux/v6.14-rc6/source/include/linux/mutex.h#L201

Regards,
Markus