linux-kernel - Re: [PATCH v3 4/6] uio: Add X-Gene QMTM UIO driver

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Message-ID: <CAPTm99VOdi6wBH_QK8w4kSFBBC7sRkh-cRuiKXmY2hJmE_8rvw@mail.gmail.com>
Date:	Tue, 21 Oct 2014 11:53:54 +0530
From:	Ankit Jindal <ankit.jindal@...aro.org>
To:	Varka Bhadram <varkabhadram@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"patches@....com" <patches@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Tushar Jagad <tushar.jagad@...aro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v3 4/6] uio: Add X-Gene QMTM UIO driver

On 21 October 2014 11:47, Varka Bhadram <varkabhadram@...il.com> wrote:
> On 10/21/2014 11:46 AM, Ankit Jindal wrote:
>>
>> On 21 October 2014 11:34, Varka Bhadram <varkabhadram@...il.com> wrote:
>>>
>>> On 10/21/2014 11:26 AM, Ankit Jindal wrote:
>>>>
>>>> The Applied Micro X-Gene SOC has on-chip QMTM (Queue manager
>>>> and Traffic manager) which is hardware based Queue or Ring
>>>> manager. This QMTM device can be used in conjunction with
>>>> other devices such as DMA Engine, Ethernet, Security Engine,
>>>> etc to assign work based on queues or rings.
>>>>
>>>> This patch allows user space access to X-Gene QMTM device.
>>>>
>>>> Signed-off-by: Ankit Jindal <ankit.jindal@...aro.org>
>>>> Signed-off-by: Tushar Jagad <tushar.jagad@...aro.org>
>>>
>>>
>>> (...)
>>>
>>>
>>>> +
>>>> +static int qmtm_probe(struct platform_device *pdev)
>>>> +{
>>>> +       struct uio_info *info;
>>>> +       struct uio_qmtm_dev *qmtm_dev;
>>>> +       struct resource *csr;
>>>> +       struct resource *fabric;
>>>> +       struct resource qpool;
>>>> +       unsigned int num_queues;
>>>> +       unsigned int devid;
>>>> +       phandle qpool_phandle;
>>>> +       struct device_node *qpool_node;
>>>> +       int ret;
>>>> +
>>>> +       qmtm_dev = devm_kzalloc(&pdev->dev, sizeof(struct uio_qmtm_dev),
>>>> +                               GFP_KERNEL);
>>>> +       if (!qmtm_dev)
>>>> +               return -ENOMEM;
>>>> +
>>>> +       qmtm_dev->info = devm_kzalloc(&pdev->dev, sizeof(*info),
>>>> GFP_KERNEL);
>>>> +       if (!qmtm_dev->info)
>>>> +               return -ENOMEM;
>>>> +
>>>> +       /* Power on qmtm in case its not done as part of boot-loader */
>>>> +       qmtm_dev->qmtm_clk = devm_clk_get(&pdev->dev, NULL);
>>>> +       if (IS_ERR(qmtm_dev->qmtm_clk)) {
>>>> +               dev_err(&pdev->dev, "Failed to get clock\n");
>>>> +               ret = PTR_ERR(qmtm_dev->qmtm_clk);
>>>> +               return ret;
>>>> +       }
>>>> +
>>>> +       csr = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>>> +       if (!csr) {
>>>> +               ret = -ENODEV;
>>>> +               dev_err(&pdev->dev, "No QMTM CSR resource specified\n");
>>>> +               goto out_err;
>>>> +       }
>>>> +
>>>
>>>
>>> This error check is not required. *csr* is checked in
>>> devm_ioremap_resource().
>>
>> I think its better to do sanity check before calling any function.
>
>
> It will be the duplication of code for sanity check. This sanity check is
> happening
> with devm_ioremap_resource(). No need to check it explicitly.

Okie, will remove it in next revision.

>
>>>> +       if (!csr->start) {
>>>> +               ret = -EINVAL;
>>>> +               dev_err(&pdev->dev, "Invalid CSR resource\n");
>>>> +               goto out_err;
>>>> +       }
>>>> +
>>>> +       fabric = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>>>> +       if (!fabric) {
>>>> +               ret = -ENODEV;
>>>> +               dev_err(&pdev->dev, "No QMTM Fabric resource
>>>> specified\n");
>>>> +               goto out_err;
>>>> +       }
>>>> +
>>>
>>>
>>> same
>>
>> We do not ioremap this address.
>
>
> Ok..
>
> --
> Regards,
> Varka Bhadram.
>
Thanks,
Ankit
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