linux-kernel - Re: [PATCH 3/9] clk: meson: axg-audio: Don't reference clk_init

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Message-ID: <c81ead7e-3e29-2a7e-aa8e-79cc0a711fb2@baylibre.com>
Date:   Wed, 31 Jul 2019 21:53:31 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH 3/9] clk: meson: axg-audio: Don't reference clk_init_data
 after registration

Hi Stephen,

Le 31/07/2019 à 21:35, Stephen Boyd a écrit :
> A future patch is going to change semantics of clk_register() so that
> clk_hw::init is guaranteed to be NULL after a clk is registered. Avoid
> referencing this member here so that we don't run into NULL pointer
> exceptions.
> 
> Cc: Neil Armstrong <narmstrong@...libre.com>
> Cc: Jerome Brunet <jbrunet@...libre.com>
> Signed-off-by: Stephen Boyd <sboyd@...nel.org>
> ---
> 
> Please ack so I can take this through clk tree
> 
>  drivers/clk/meson/axg-audio.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/meson/axg-audio.c b/drivers/clk/meson/axg-audio.c
> index 8028ff6f6610..db0b73d53551 100644
> --- a/drivers/clk/meson/axg-audio.c
> +++ b/drivers/clk/meson/axg-audio.c
> @@ -992,15 +992,18 @@ static int axg_audio_clkc_probe(struct platform_device *pdev)
>  
>  	/* Take care to skip the registered input clocks */
>  	for (i = AUD_CLKID_DDR_ARB; i < data->hw_onecell_data->num; i++) {
> +		const char *name;
> +
>  		hw = data->hw_onecell_data->hws[i];
>  		/* array might be sparse */
>  		if (!hw)
>  			continue;
>  
> +		name = hw->init->name;
> +
>  		ret = devm_clk_hw_register(dev, hw);
>  		if (ret) {
> -			dev_err(dev, "failed to register clock %s\n",
> -				hw->init->name);
> +			dev_err(dev, "failed to register clock %s\n", name);
>  			return ret;
>  		}
>  	}
> 

Acked-by: Neil Armstrong <narmstrong@...libre.com>