linux-kernel - Re: [PATCH] clk: rs9: Convert to clk_hw_onecell_data and of_clk_hw_onecell

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Message-ID: <6d7b4e5f-fb33-47f7-8600-4127d2eef069@mailbox.org>
Date: Tue, 20 Jan 2026 10:59:15 +0100
From: Marek Vasut <marek.vasut@...lbox.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Michael Turquette <mturquette@...libre.com>,
 Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: rs9: Convert to clk_hw_onecell_data and
 of_clk_hw_onecell_get()

On 1/20/26 10:12 AM, Geert Uytterhoeven wrote:

Hello Geert,

> On Mon, 19 Jan 2026 at 20:36, Marek Vasut <marek.vasut@...lbox.org> wrote:
>> On 1/19/26 4:23 PM, Geert Uytterhoeven wrote:
>>> rs9_of_clk_get() does not validate the clock index in the passed
>>> DT clock specifier.  If DT specifies an incorrect and out-of-range
>>> index, this may access memory beyond the end of the fixed-size clk_dif[]
>>> array.
>>>
>>> Instead of fixing this by adding a range check to rs9_of_clk_get(),
>>> convert the driver to use the of_clk_hw_onecell_get() helper, which
>>> already contains such a check.  Embedding a clk_hw_onecell_data
>>> structure in the rs9_driver_data structure has the added benefit that
>>> the clock array always has the correct size, and thus can no longer
>>> become out of sync when adding support for new rs9 variants.
>>>
>>> Fixes: 892e0ddea1aa6f70 ("clk: rs9: Add Renesas 9-series PCIe clock generator driver")
>>> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
>>> ---
>>> While this patch applies on top of "[PATCH v2] clk: rs9: Reserve 8
>>> struct clk_hw slots for for 9FGV0841", it can be applied or backported
>>> without, by ignoring the change from "clk_dif[4]" to "clk_dif[8]".
>>
>> Since the 9FGV0841 is the biggest part in the 9FGV series, the one-liner
>> fix I posted is better suited as a stable backport. This rework
>> shouldn't have the Fixes tag, since it is only that, a rework.
> 
> This is not just a rework, as it also fixes a second issue.
> But since you prefer simpler fixes, I have submitted a v2 that just
> adds the missing range check[2].  We can revisit the conversion to
> of_clk_hw_onecell_get() later, after all fixes have landed.
This is nice, thank you !