linux-kernel - Re: [PATCH v4 03/12] PCI: brcmstb: Use common error handling code in brcm_pcie

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Message-ID: <CA+-6iNz9R5uMogd6h+BkgRvKrsmyH2VXsGO_5e=6yqC=JzjigA@mail.gmail.com>
Date: Thu, 25 Jul 2024 15:45:59 -0400
From: Jim Quinlan <james.quinlan@...adcom.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: linux-pci@...r.kernel.org, Nicolas Saenz Julienne <nsaenz@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, 
	Cyril Brulebois <kibi@...ian.org>, Stanimir Varbanov <svarbanov@...e.de>, 
	Krzysztof Kozlowski <krzk@...nel.org>, bcm-kernel-feedback-list@...adcom.com, 
	jim2101024@...il.com, Florian Fainelli <florian.fainelli@...adcom.com>, 
	Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kw@...ux.com>, 
	Rob Herring <robh@...nel.org>, 
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" <linux-rpi-kernel@...ts.infradead.org>, 
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>, 
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 03/12] PCI: brcmstb: Use common error handling code in brcm_pcie_probe()

On Thu, Jul 25, 2024 at 12:31 AM Manivannan Sadhasivam
<manivannan.sadhasivam@...aro.org> wrote:
>
> On Tue, Jul 16, 2024 at 05:31:18PM -0400, Jim Quinlan wrote:
> > o Move the clk_prepare_enable() below the resource allocations.
> > o Add a jump target (clk_out) so that a bit of exception handling can be
> >   better reused at the end of this function implementation.
> >
> > Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> > Reviewed-by: Stanimir Varbanov <svarbanov@...e.de>
> > Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
> > ---
> >  drivers/pci/controller/pcie-brcmstb.c | 29 +++++++++++++++------------
> >  1 file changed, 16 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> > index c08683febdd4..c257434edc08 100644
> > --- a/drivers/pci/controller/pcie-brcmstb.c
> > +++ b/drivers/pci/controller/pcie-brcmstb.c
> > @@ -1613,31 +1613,30 @@ static int brcm_pcie_probe(struct platform_device *pdev)
> >
> >       pcie->ssc = of_property_read_bool(np, "brcm,enable-ssc");
> >
> > -     ret = clk_prepare_enable(pcie->clk);
> > -     if (ret) {
> > -             dev_err(&pdev->dev, "could not enable clock\n");
> > -             return ret;
> > -     }
> >       pcie->rescal = devm_reset_control_get_optional_shared(&pdev->dev, "rescal");
> > -     if (IS_ERR(pcie->rescal)) {
> > -             clk_disable_unprepare(pcie->clk);
> > +     if (IS_ERR(pcie->rescal))
> >               return PTR_ERR(pcie->rescal);
> > -     }
> > +
> >       pcie->perst_reset = devm_reset_control_get_optional_exclusive(&pdev->dev, "perst");
> > -     if (IS_ERR(pcie->perst_reset)) {
> > -             clk_disable_unprepare(pcie->clk);
> > +     if (IS_ERR(pcie->perst_reset))
> >               return PTR_ERR(pcie->perst_reset);
> > +
> > +     ret = clk_prepare_enable(pcie->clk);
> > +     if (ret) {
> > +             dev_err(&pdev->dev, "could not enable clock\n");
> > +             return ret;
> >       }
> >
> >       ret = reset_control_reset(pcie->rescal);
> > -     if (ret)
> > +     if (ret) {
> >               dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
> > +             goto clk_out;
>
> Please use a descriptive name for the err labels. Here this err path disables
> and unprepares the clk, so use 'clk_disable_unprepare'.
ack
>
> > +     }
> >
> >       ret = brcm_phy_start(pcie);
> >       if (ret) {
> >               reset_control_rearm(pcie->rescal);
> > -             clk_disable_unprepare(pcie->clk);
> > -             return ret;
> > +             goto clk_out;
> >       }
> >
> >       ret = brcm_pcie_setup(pcie);
> > @@ -1676,6 +1675,10 @@ static int brcm_pcie_probe(struct platform_device *pdev)
> >
> >       return 0;
> >
> > +clk_out:
> > +     clk_disable_unprepare(pcie->clk);
> > +     return ret;
> > +
>
> This is leaking the resources. Move this new label below 'fail'.
What resources is it leaking?  At "clk_out" the return value will be negative
and only managed resources have been allocated at that juncture.

Regards,
Jim Quinlan
Broadcom STB/CM

>
> - Mani
>
> --
> மணிவண்ணன் சதாசிவம்

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