linux-kernel - Re: [PATCH 03/14] media: sun6i-csi: Support an optional dedicated memory pool

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Date:   Mon, 26 Oct 2020 16:41:04 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-sunxi@...glegroups.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Yong Deng <yong.deng@...ewell.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Hans Verkuil <hverkuil@...all.nl>, kevin.lhopital@...mail.com
Subject: Re: [PATCH 03/14] media: sun6i-csi: Support an optional dedicated
 memory pool

On Fri, Oct 23, 2020 at 07:45:35PM +0200, Paul Kocialkowski wrote:
> This allows selecting a dedicated CMA memory pool (specified via
> device-tree) instead of the default one.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

Why would that be needed?

> ---
>  drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> index 28e89340fed9..5d2389a5cd17 100644
> --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> @@ -16,6 +16,7 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> +#include <linux/of_reserved_mem.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/regmap.h>
> @@ -849,6 +850,12 @@ static int sun6i_csi_resource_request(struct sun6i_csi_dev *sdev,
>  		return PTR_ERR(sdev->regmap);
>  	}
>  
> +	ret = of_reserved_mem_device_init(&pdev->dev);
> +	if (ret && ret != -ENODEV) {
> +		dev_err(&pdev->dev, "Unable to init reserved memory\n");
> +		return ret;
> +	}
> +
>  	sdev->clk_mod = devm_clk_get(&pdev->dev, "mod");

If that clk_get or any subsequent function fail you'll end up leaking
whatever the initialization of the reserved memory has allocated

Maxime

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