linux-kernel - Re: [PATCH] clk: sunxi-ng: v3s: Fix incorrect number of hw

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Date:   Mon, 11 Nov 2019 13:39:36 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Tian Yunhao <t123yh@...look.com>
Cc:     Icenowy Zheng <icenowy@...c.io>, Chen-Yu Tsai <wens@...e.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: sunxi-ng: v3s: Fix incorrect number of hw_clks.

Hi,

Thanks for your patch

On Sat, Nov 09, 2019 at 03:19:09PM +0000, Tian Yunhao wrote:
> The hws field of sun8i_v3s_hw_clks has only 74
> members. However, the number specified by CLK_NUMBER
> is 77 (= CLK_I2S0 + 1). This leads to runtime segmentation
> fault that is not always reproducible.
>
> This patch adds a protective field [CLK_NUMBER] which ensures
> ARRAY_SIZE(.hws) is always greater than .num, thus eliminates
> this error.
>
> Signed-off-by: Yunhao Tian <t123yh@...look.com>
> ---
>  drivers/clk/sunxi-ng/ccu-sun8i-v3s.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c b/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c
> index 5c779eec454b..de7fce7f32e6 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c
> @@ -617,6 +617,7 @@ static struct clk_hw_onecell_data sun8i_v3s_hw_clks = {
>  		[CLK_AVS]		= &avs_clk.common.hw,
>  		[CLK_MBUS]		= &mbus_clk.common.hw,
>  		[CLK_MIPI_CSI]		= &mipi_csi_clk.common.hw,
> +		[CLK_NUMBER]    = NULL,
>  	},
>  	.num	= CLK_NUMBER,
>  };
> @@ -699,6 +700,7 @@ static struct clk_hw_onecell_data sun8i_v3_hw_clks = {
>  		[CLK_AVS]		= &avs_clk.common.hw,
>  		[CLK_MBUS]		= &mbus_clk.common.hw,
>  		[CLK_MIPI_CSI]		= &mipi_csi_clk.common.hw,
> +		[CLK_NUMBER]    = NULL,
>  	},
>  	.num	= CLK_NUMBER,

I'd rather have the number of clocks (.num) being properly set.

Maxime

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