linux-kernel - Re: [PATCH v2 3/6] usb: ohci-exynos: Use devm_clk_get

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Date: Thu, 4 Apr 2024 13:20:07 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Alan Stern <stern@...land.harvard.edu>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Alim Akhtar <alim.akhtar@...sung.com>, 
	Christophe JAILLET <christophe.jaillet@...adoo.fr>, Johan Hovold <johan@...nel.org>, 
	linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/6] usb: ohci-exynos: Use devm_clk_get_enabled() helpers

Hi Krzysztof,


On Thu, 4 Apr 2024 at 12:50, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 04/04/2024 09:13, 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@...il.com>
> > ---
> > v2: new changes in this series.
> > ---
> >  drivers/usb/host/ohci-exynos.c | 19 +++++--------------
> >  1 file changed, 5 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
> > index 20e26a474591..85d04ae0ae40 100644
> > --- a/drivers/usb/host/ohci-exynos.c
> > +++ b/drivers/usb/host/ohci-exynos.c
> > @@ -135,20 +135,15 @@ static int exynos_ohci_probe(struct platform_device *pdev)
> >
> >       err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
> >       if (err)
> > -             goto fail_clk;
> > -
> > -     exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
> > +             goto fail_io;
> >
> > +     exynos_ohci->clk = devm_clk_get_enabled(&pdev->dev, "usbhost");
> >       if (IS_ERR(exynos_ohci->clk)) {
> > -             dev_err(&pdev->dev, "Failed to get usbhost clock\n");
> > -             err = PTR_ERR(exynos_ohci->clk);
> > -             goto fail_clk;
> > +             usb_put_hcd(hcd);
> > +             return dev_err_probe(&pdev->dev, PTR_ERR(exynos_ohci->clk),
> > +                             "Failed to get usbhost clock\n");
>
> Why do you introduce entirely parallel exit paths? There is already
> single error handling part with labels. Use that.
>
OK, I  will use the labels to return over here,
>
>
> Best regards,
> Krzysztof
>
Thanks

-Anand