linux-kernel - Re: [PATCH 1/9] clk: actions: Don't reference clk_init

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Message-ID: <20190816112210.GA27094@mani>
Date:   Fri, 16 Aug 2019 16:52:10 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH 1/9] clk: actions: Don't reference clk_init_data after
 registration

On Wed, Jul 31, 2019 at 12:35:09PM -0700, Stephen Boyd wrote:
> 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: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Signed-off-by: Stephen Boyd <sboyd@...nel.org>
> ---
> 
> Please ack so I can take this through clk tree
> 
>  drivers/clk/actions/owl-common.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/actions/owl-common.c b/drivers/clk/actions/owl-common.c
> index 32dd29e0a37e..71b683c4e643 100644
> --- a/drivers/clk/actions/owl-common.c
> +++ b/drivers/clk/actions/owl-common.c
> @@ -68,6 +68,7 @@ int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
>  	struct clk_hw *hw;
>  
>  	for (i = 0; i < hw_clks->num; i++) {
> +		const char *name = hw->init->name;
>  

This should come after below statement and hence the warning is generated
in linux-next. Sorry for missing!

Thanks,
Mani

>  		hw = hw_clks->hws[i];
>  
> @@ -77,7 +78,7 @@ int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
>  		ret = devm_clk_hw_register(dev, hw);
>  		if (ret) {
>  			dev_err(dev, "Couldn't register clock %d - %s\n",
> -				i, hw->init->name);
> +				i, name);
>  			return ret;
>  		}
>  	}
> -- 
> Sent by a computer through tubes
>