linux-kernel - Re: [PATCH v3 4/4] media: chips-media: wave5: Improve performance of decoder

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Message-ID: <f27c03e0-732b-431f-9127-1da9f0771135@web.de>
Date: Tue, 16 Sep 2025 13:21:28 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Jackson Lee <jackson.lee@...psnmedia.com>,
 Nas Chung <nas.chung@...psnmedia.com>, linux-media@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>, Brandon Brnich <b-brnich@...com>,
 Hans Verkuil <hverkuil-cisco@...all.nl>, Hans Verkuil <hverkuil@...all.nl>,
 Lafley Kim <lafley.kim@...psnmedia.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Nicolas Dufresne <nicolas.dufresne@...labora.com>,
 Robert Beckett <bob.beckett@...labora.com>
Subject: Re: [PATCH v3 4/4] media: chips-media: wave5: Improve performance of
 decoder

…
> To archive this goal, the device_run() calls v4l2_m2m_job_finish
…

     achieve?


…
> +++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
…
> @@ -1236,6 +1235,11 @@ static void wave5_vpu_dec_buf_queue_src(struct vb2_buffer *vb)
>  	vbuf->sequence = inst->queued_src_buf_num++;
>  
>  	v4l2_m2m_buf_queue(m2m_ctx, vbuf);
> +
> +	INIT_LIST_HEAD(&vpu_buf->list);
> +	mutex_lock(&inst->feed_lock);
> +	list_add_tail(&vpu_buf->list, &inst->avail_src_bufs);
> +	mutex_unlock(&inst->feed_lock);
> +}
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&inst->feed_lock);”?
https://elixir.bootlin.com/linux/v6.17-rc6/source/include/linux/mutex.h#L228

Regards,
Markus