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

Markus Elfring
2024-07-29T11:01:38Z

…
> +++ 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