Re: [PATCH v2 1/6] usb: ehci-exynos: Use devm_clk_get_enabled() helpers - Greg Kroah-Hartman

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Anand Moon <linux.amoon@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>,
	Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
	Johan Hovold <johan@kernel.org>,
	linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/6] usb: ehci-exynos: Use devm_clk_get_enabled() helpers
Date: Thu, 4 Apr 2024 15:00:48 +0200	[thread overview]
Message-ID: <2024040442-subscript-detective-8d12@gregkh> (raw)
In-Reply-To: <20240404071350.4242-2-linux.amoon@gmail.com>

On Thu, Apr 04, 2024 at 12:43:17PM +0530, Anand Moon wrote:
> The devm_clk_get_enabled() helpers:
>     - call devm_clk_get()
>     - call clk_prepare_enable() and register what is needed in order to
>      call clk_disable_unprepare() when needed, as a managed resource.
> 
> This simplifies the code and avoids the calls to clk_disable_unprepare().
> 
> While at it, use dev_err_probe consistently, and use its return value
> to return the error code.
> 
> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> ---
> V2: drop the clk_disable_unprepare in suspend/resume functions
>     fix the usb_put_hcd return before the devm_clk_get_enabled
> ---
>  drivers/usb/host/ehci-exynos.c | 19 +++++--------------
>  1 file changed, 5 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
> index f644b131cc0b..f00bfd0b13dc 100644
> --- a/drivers/usb/host/ehci-exynos.c
> +++ b/drivers/usb/host/ehci-exynos.c
> @@ -159,20 +159,15 @@ static int exynos_ehci_probe(struct platform_device *pdev)
>  
>  	err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
>  	if (err)
> -		goto fail_clk;
> -
> -	exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
> +		goto fail_io;
>  
> +	exynos_ehci->clk = devm_clk_get_enabled(&pdev->dev, "usbhost");
>  	if (IS_ERR(exynos_ehci->clk)) {
> -		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
> -		err = PTR_ERR(exynos_ehci->clk);
> -		goto fail_clk;
> +		usb_put_hcd(hcd);
> +		return dev_err_probe(&pdev->dev, PTR_ERR(exynos_ehci->clk),
> +				  "Failed to get usbhost clock\n");

Why is this logic changed?

If you want to call dev_err_probe(), that's great, but do NOT mix it up
with a commit that does something totally different.

When you say something like "while at it" in a changelog text, that is a
HUGE hint that it needs to be a separate commit.  Because of that reason
alone, I can't take these, you know better :(

thanks,

greg k-h