linux-kernel - Re: [PATCH v3 2/2] drm/tiny: Add driver for Sharp Memory LCD

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Message-ID: <0b1ee6f7-b24d-49a6-ba90-d917c864ecf4@web.de>
Date: Mon, 29 Jul 2024 13:00:47 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Alex Lanzano <lanzano.alex@...il.com>,
 Mehdi Djait <mehdi.djait@...tlin.com>, dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>,
 Christophe Jaillet <christophe.jaillet@...adoo.fr>,
 Conor Dooley <conor+dt@...nel.org>, Daniel Vetter <daniel@...ll.ch>,
 David Airlie <airlied@...il.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Rob Herring <robh@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>
Subject: Re: [PATCH v3 2/2] drm/tiny: Add driver for Sharp Memory LCD

…
> +++ b/drivers/gpu/drm/tiny/sharp-memory.c
> @@ -0,0 +1,684 @@
…
> static int sharp_memory_update_display(struct sharp_memory_device *smd,
> +				       struct drm_framebuffer *fb,
> +				       struct drm_rect clip,
> +				       struct drm_format_conv_state *fmtcnv_state)
> +{
…
> +	mutex_lock(&smd->tx_mutex);
> +
> +	/* Populate the transmit buffer with frame data */
…
> +	mutex_unlock(&smd->tx_mutex);
> +
> +	return ret;
> +}
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&smd->tx_mutex);”?
https://elixir.bootlin.com/linux/v6.10.2/source/include/linux/mutex.h#L196

Regards,
Markus