linux-kernel - Re: [PATCH v2] clk: Skip clk provider registration when np is NULL

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Date:   Tue, 27 Apr 2021 16:57:30 +0200
From:   nicolas saenz julienne <nsaenz@...nel.org>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        mturquette@...libre.com, sboyd@...nel.org, maxime@...no.tech,
        khilman@...nel.org, ulf.hansson@...aro.org, len.brown@...el.com,
        pavel@....cz, robh+dt@...nel.org, frowand.list@...il.com,
        maz@...nel.org, tglx@...utronix.de, saravanak@...gle.com,
        geert@...ux-m68k.org, nsaenzjulienne@...e.de, linux@...ck-us.net,
        guillaume.tucker@...labora.com
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        corbet@....net, nicolas.ferre@...rochip.com,
        claudiu.beznea@...rochip.com, linux-doc@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-acpi@...r.kernel.org, kernel-team@...roid.com,
        linux-rpi-kernel@...ts.infradead.org,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH v2] clk: Skip clk provider registration when np is NULL

On Mon, 2021-04-26 at 09:56 +0300, Tudor Ambarus wrote:
> commit 6579c8d97ad7 ("clk: Mark fwnodes when their clock provider is added")
> revealed that clk/bcm/clk-raspberrypi.c driver calls
> devm_of_clk_add_hw_provider(), with a NULL dev->of_node, which resulted in a
> NULL pointer dereference in of_clk_add_hw_provider() when calling
> fwnode_dev_initialized().
> 
> Returning 0 is reducing the if conditions in driver code and is being
> consistent with the CONFIG_OF=n inline stub that returns 0 when CONFIG_OF
> is disabled. The downside is that drivers will maybe register clkdev lookups
> when they don't need to and waste some memory.
> 
> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Fixes: 6579c8d97ad7 ("clk: Mark fwnodes when their clock provider is added")
> Fixes: 3c9ea42802a1 ("clk: Mark fwnodes when their clock provider is added/removed")
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> Reviewed-by: Stephen Boyd <sboyd@...nel.org>
> ---

Reviewed-by: Nicolas Saenz Julienne <nsaenz@...nel.org>

Regards,
Nicolas