linux-kernel - Re: [PATCH v6 1/5] ARM: add basic support for Trusted Foundations

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Message-ID: <87d2o4edus.fsf@linaro.org>
Date:	Thu, 19 Sep 2013 13:49:31 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Dave Martin <Dave.Martin@....com>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Linus Walleij <linus.walleij@...aro.org>, gnurou@...il.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 1/5] ARM: add basic support for Trusted Foundations

Alexandre Courbot <acourbot@...dia.com> writes:

> Trusted Foundations is a TrustZone-based secure monitor for ARM that
> can be invoked using the same SMC-based API on all supported
> platforms. This patch adds initial basic support for Trusted
> Foundations using the ARM firmware API. Current features are limited
> to the ability to boot secondary processors.

[...]

> +#if IS_ENABLED(CONFIG_OF)
> +void of_register_trusted_foundations(void)
> +{
> +	struct device_node *node;
> +	struct trusted_foundations_platform_data pdata;
> +	int err;
> +
> +	node = of_find_compatible_node(NULL, NULL, "tl,trusted-foundations");
> +	if (!node)
> +		return;
> +
> +	err = of_property_read_u32(node, "version-major", &pdata.version_major);
> +	if (err != 0)
> +		panic("Trusted Foundation: missing version-major property\n");

Do really need to panic() the whole kernel for a missing property?
Surely this can more gracefully recover, or assume some defaults?  

Same comment for the other uses of panic() in this patch.

Kevin

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