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

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Message-ID: <2702aa0d-7f60-05c1-7b9b-cfe313024886@canonical.com>
Date:   Mon, 21 Sep 2020 22:03:33 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Jim Quinlan <james.quinlan@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     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

On 21/09/2020 21:53, Jim Quinlan wrote:
> 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
> 

I'll send a V2 in a short while
> 
>>
>> --
>> Florian