linux-kernel - Re: [PATCH][next] PCI: tegra: tegra194: fix phy

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Date:   Wed, 21 Aug 2019 20:31:42 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Colin King <colin.king@...onical.com>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        <linux-pci@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] PCI: tegra: tegra194: fix phy_count less than zero
 check

On 8/21/2019 7:35 PM, Lorenzo Pieralisi wrote:
> On Wed, Aug 21, 2019 at 01:01:23PM +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> The check for pcie->phy_count < 0 is always false because phy_count
>> is an unsigned int and can never be less than zero. Fix this by
>> assigning ret to the return from of_property_count_strings and
>> checking if this is less than zero instead.
>>
>> Addresses-Coverity: ("Dead code")
>> Fixes: 6404441c8e13 ("PCI: tegra: Add Tegra194 PCIe support")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>   drivers/pci/controller/dwc/pcie-tegra194.c | 9 +++++----
>>   1 file changed, 5 insertions(+), 4 deletions(-)
> 
> Squashed in the original commit (it is not merged yet), thanks
> for reporting it.
Thanks Colin for catching it and pushing a fix also.
Thanks Lorenzo for merging it.
Apologies for missing this in my patch series.

> 
> Lorenzo
> 
>> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
>> index fc0dbeb31d78..b47ea3e68303 100644
>> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
>> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
>> @@ -969,12 +969,13 @@ static int tegra_pcie_dw_parse_dt(struct tegra_pcie_dw *pcie)
>>   		return ret;
>>   	}
>>   
>> -	pcie->phy_count = of_property_count_strings(np, "phy-names");
>> -	if (pcie->phy_count < 0) {
>> +	ret = of_property_count_strings(np, "phy-names");
>> +	if (ret < 0) {
>>   		dev_err(pcie->dev, "Failed to find PHY entries: %d\n",
>> -			pcie->phy_count);
>> -		return pcie->phy_count;
>> +			ret);
>> +		return ret;
>>   	}
>> +	pcie->phy_count = ret;
>>   
>>   	if (of_property_read_bool(np, "nvidia,update-fc-fixup"))
>>   		pcie->update_fc_fixup = true;
>> -- 
>> 2.20.1
>>