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Date:   Fri, 26 Jun 2020 20:24:11 +0300
From:   Dan Carpenter <dan.carpenter@oracle.com>
To:     Pawel Laszczak <pawell@cadence.com>
Cc:     "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "balbi@kernel.org" <balbi@kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "ben.dooks@codethink.co.uk" <ben.dooks@codethink.co.uk>,
        "colin.king@canonical.com" <colin.king@canonical.com>,
        "rogerq@ti.com" <rogerq@ti.com>,
        "peter.chen@nxp.com" <peter.chen@nxp.com>,
        "weiyongjun1@huawei.com" <weiyongjun1@huawei.com>,
        Jayshri Dajiram Pawar <jpawar@cadence.com>,
        Rahul Kumar <kurahul@cadence.com>,
        Sanket Parmar <sparmar@cadence.com>
Subject: Re: [PATCH RFC 2/5] usb:cdns3: Add pci to platform driver wrapper
Message-ID: <20200626172411.GE2571@kadam>
References: <20200626045450.10205-1-pawell@cadence.com>
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 <20200626114057.GD2571@kadam>
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On Fri, Jun 26, 2020 at 03:10:32PM +0000, Pawel Laszczak wrote:
> >> +static int cdnsp_pci_probe(struct pci_dev *pdev,
> >> +			   const struct pci_device_id *id)
> >> +{
> >> +	struct platform_device_info plat_info;
> >> +	struct cdnsp_wrap *wrap;
> >> +	struct resource *res;
> >> +	struct pci_dev *func;
> >> +	int err;
> >> +
> >> +	/*
> >> +	 * For GADGET/HOST PCI (devfn) function number is 0,
> >> +	 * for OTG PCI (devfn) function number is 1.
> >> +	 */
> >> +	if (!id || (pdev->devfn != PCI_DEV_FN_HOST_DEVICE &&
> >> +		    pdev->devfn != PCI_DEV_FN_OTG))
> >> +		return -EINVAL;
> >> +
> >> +	func = cdnsp_get_second_fun(pdev);
> >> +	if (unlikely(!func))
> >> +		return -EINVAL;
> >> +
> >> +	if (func->class == PCI_CLASS_SERIAL_USB_XHCI ||
> >> +	    pdev->class == PCI_CLASS_SERIAL_USB_XHCI)
> >> +		return -EINVAL;
> >
> >
> >Do we need call pci_put_device(func) before returning?
> 
> We don't need.
> Such function doesn't exist.
> 

I meant pci_dev_put().  I'm pretty sure that we do need it to match the
pci_get_device() in cdnsp_get_second_fun().

regards,
dan carpenter