linux-kernel - Re: [PATCH v3] clk: mediatek: mt8365: Fix index issue

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Date:   Tue, 30 May 2023 10:17:27 +0200
From:   Markus Schneider-Pargmann <msp@...libre.com>
To:     Alexandre Mergnat <amergnat@...libre.com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3] clk: mediatek: mt8365: Fix index issue

On Fri, May 26, 2023 at 03:10:43PM +0200, Alexandre Mergnat wrote:
> Before the patch [1], the clock probe was done directly in the
> clk-mt8365 driver. In this probe function, the array which stores the
> data clocks is sized using the higher defined numbers (*_NR_CLOCK) in
> the clock lists [2]. Currently, with the patch [1], the specific
> clk-mt8365 probe function is replaced by the mtk generic one [3], which
> size the clock data array by adding all the clock descriptor array size
> provided by the clk-mt8365 driver.
> 
> Actually, all clock indexes come from the header file [2], that mean, if
> there are more clock (then more index) in the header file [2] than the
> number of clock declared in the clock descriptor arrays (which is the
> case currently), the clock data array will be undersized and then the
> generic probe function will overflow when it will try to write in
> "clk_data[CLK_INDEX]". Actually, instead of crashing at boot, the probe
> function returns an error in the log which looks like:
> "of_clk_hw_onecell_get: invalid index 135", then this clock isn't
> enabled.
> 
> Solve this issue by adding in the driver the missing clocks declared in
> the header clock file [2].
> 
> [1]: Commit ffe91cb28f6a ("clk: mediatek: mt8365: Convert to
>      mtk_clk_simple_{probe,remove}()")
> [2]: include/dt-bindings/clock/mediatek,mt8365-clk.h
> [3]: drivers/clk/mediatek/clk-mtk.c
> 
> Fixes: ffe91cb28f6a ("clk: mediatek: mt8365: Convert to mtk_clk_simple_{probe,remove}()")
> 
> Signed-off-by: Alexandre Mergnat <amergnat@...libre.com>

Reviewed-by: Markus Schneider-Pargmann <msp@...libre.com>
Tested-by: Markus Schneider-Pargmann <msp@...libre.com>

Best,
Markus