linux-kernel - Re: [PATCH][next] PCI: brcmstb: fix a missing if statement on a return error check

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Date:   Mon, 21 Sep 2020 16:53:18 -0400
From:   Jim Quinlan <james.quinlan@...adcom.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Colin King <colin.king@...onical.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Jim Quinlan <jquinlan@...adcom.com>,
        "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:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" 
        <linux-pci@...r.kernel.org>, kernel-janitors@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] PCI: brcmstb: fix a missing if statement on a
 return error check

Hello,
I am fine with Colin's suggested change or Florians as well:

         ret = brcm_phy_start(pcie);
+        if (ret) {
+                clk_disable_unprepare(pcie->clk);
                 return ret;
+        }

Currently, our STB upstream suspend/resume is not functional yet and
this is how this omission slipped by testing.

Thanks,
Jim Quinlan
Broadcom STB

On Mon, Sep 21, 2020 at 3:43 PM Florian Fainelli <f.fainelli@...il.com> wrote:
>
> On 9/21/20 7:40 AM, Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> >
> > The error return ret is not being check with an if statement and
> > currently the code always returns leaving the following code as
> > dead code. Fix this by adding in the missing if statement.
> >
> > Addresses-Coverity: ("Structurally dead code")
> > Fixes: ad3d29c77e1e ("PCI: brcmstb: Add control of rescal reset")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > ---
> >  drivers/pci/controller/pcie-brcmstb.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> > index 7a3ff4632e7c..cb0c11b7308e 100644
> > --- a/drivers/pci/controller/pcie-brcmstb.c
> > +++ b/drivers/pci/controller/pcie-brcmstb.c
> > @@ -1154,6 +1154,7 @@ static int brcm_pcie_resume(struct device *dev)
> >       clk_prepare_enable(pcie->clk);
> >
> >       ret = brcm_phy_start(pcie);
> > +     if (ret)
> >               return ret;
>
> Maybe this should also disable the clock if we failed to start the PHY
> somehow.

Hi Florian,

I'm fine with Colin's change as


>
> --
> Florian

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