linux-kernel - Re: [PATCH v6 1/2] clk: Provide managed helper to get and enable bulk clocks

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Date: Tue, 5 Mar 2024 11:50:29 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Shradha Todi <shradha.t@...sung.com>
Cc: linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, mturquette@...libre.com,
	sboyd@...nel.org, jingoohan1@...il.com, lpieralisi@...nel.org,
	kw@...ux.com, robh@...nel.org, bhelgaas@...gle.com,
	krzysztof.kozlowski@...aro.org, alim.akhtar@...sung.com,
	linux@...linux.org.uk, m.szyprowski@...sung.com,
	manivannan.sadhasivam@...aro.org, pankaj.dubey@...sung.com,
	gost.dev@...sung.com
Subject: Re: [PATCH v6 1/2] clk: Provide managed helper to get and enable
 bulk clocks

On Tue, Feb 20, 2024 at 02:10:45PM +0530, Shradha Todi wrote:
> +int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
> +					      struct clk_bulk_data **clks)
> +{
> +	struct clk_bulk_devres *devres;
> +	int ret;
> +
> +	devres = devres_alloc(devm_clk_bulk_release_all_enable,
> +			      sizeof(*devres), GFP_KERNEL);
> +	if (!devres)
> +		return -ENOMEM;
> +
> +	ret = clk_bulk_get_all(dev, &devres->clks);
> +	if (ret > 0) {

I feel like this should be >= instead of >.  There aren't any callers
of this function yet so we can't see what's in *clks at the start but
it's easy to imagine a situation where it's bad data.

> +		*clks = devres->clks;
> +		devres->num_clks = ret;
> +	} else {
> +		devres_free(devres);
> +		return ret;

When clk_bulk_get_all() returns zero then we return success here.

regards,
dan carpenter

> +	}
> +
> +	ret = clk_bulk_prepare_enable(devres->num_clks, *clks);
> +	if (!ret) {
> +		devres_add(dev, devres);
> +	} else {
> +		clk_bulk_put_all(devres->num_clks, devres->clks);
> +		devres_free(devres);
> +	}
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all_enable);
> +