linux-kernel - Re: [PATCH] clk: mediatek: mt8183: Add back SSPM related clocks

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Message-ID: <25fd7919e449d2a6ffe69c8cb50ba34c.sboyd@kernel.org>
Date:   Wed, 19 Jul 2023 12:40:26 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Chen-Yu Tsai <wenst@...omium.org>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] clk: mediatek: mt8183: Add back SSPM related clocks

Quoting Chen-Yu Tsai (2023-07-19 00:42:50)
> This reverts commit 860690a93ef23b567f781c1b631623e27190f101.
> 
> On the MT8183, the SSPM related clocks were removed claiming a lack of
> usage. This however causes some issues when the driver was converted to
> the new simple-probe mechanism. This mechanism allocates enough space
> for all the clocks defined in the clock driver, not the highest index
> in the DT binding. This leads to out-of-bound writes if their are holes
> in the DT binding or the driver (due to deprecated or unimplemented
> clocks). These errors can go unnoticed and cause memory corruption,
> leading to crashes in unrelated areas, or nothing at all. KASAN will
> detect them.
> 
> Add the SSPM related clocks back to the MT8183 clock driver to fully
> implement the DT binding. The SSPM clocks are for the power management
> co-processor, and should never be turned off. They are marked as such.
> 
> Fixes: 3f37ba7cc385 ("clk: mediatek: mt8183: Convert all remaining clocks to common probe")
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> ---

Applied to clk-fixes