linux-kernel - Re: [PATCH V11 3/7] dma: add Qualcomm Technologies HIDMA management driver

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Date:	Sun, 10 Jan 2016 08:14:11 -0500
From:	Sinan Kaya <okaya@...eaurora.org>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	dmaengine <dmaengine@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Timur Tabi <timur@...eaurora.org>,
	devicetree <devicetree@...r.kernel.org>,
	Christopher Covington <cov@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>, jcm@...hat.com,
	Andy Gross <agross@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>, linux-arm-msm@...r.kernel.org,
	linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V11 3/7] dma: add Qualcomm Technologies HIDMA management
 driver


>> +
>> +static int set_priority(struct hidma_mgmt_dev *mdev, unsigned int i, u64 val)
>> +{
>> +       u64 tmp;
>> +       int rc;
>> +
>> +       if (i > mdev->dma_channels)
> 
> Shouldn't be >= ? I somehow missed that.
>
Corrected.

 
>> +               return -EINVAL;
>> +
>> +       tmp = mdev->priority[i];
>> +       mdev->priority[i] = val;
>> +       rc = hidma_mgmt_setup(mdev);
>> +       if (rc)
>> +               mdev->priority[i] = tmp;
>> +       return rc;
>> +}
>> +
>> +static int set_weight(struct hidma_mgmt_dev *mdev, unsigned int i, u64 val)
>> +{
>> +       u64 tmp;
>> +       int rc;
>> +
>> +       if (i > mdev->dma_channels)
> 
> Ditto.
OK

> 
>> +               return -EINVAL;
>> +
>> +       tmp = mdev->weight[i];
>> +       mdev->weight[i] = val;
>> +       rc = hidma_mgmt_setup(mdev);
>> +       if (rc)
>> +               mdev->weight[i] = tmp;
>> +       return rc;
>> +}
>> +

>> +
>> +int hidma_mgmt_init_sys(struct hidma_mgmt_dev *mdev)
>> +{
>> +       unsigned int i;
>> +       int rc;
>> +       int required;
>> +       struct kobject *chanops;
>> +
>> +       required = sizeof(*mdev->chroots) * mdev->dma_channels;
>> +       mdev->chroots = devm_kmalloc(&mdev->pdev->dev, required, GFP_KERNEL);
>> +       if (!mdev->chroots)
>> +               return -ENOMEM;
>> +
>> +       chanops = kobject_create_and_add("chanops", &mdev->pdev->dev.kobj);
>> +       if (!chanops)
>> +               return -ENOMEM;
>> +
>> +       /* create each channel directory here */
>> +       for (i = 0; i < mdev->dma_channels; i++) {
>> +               char name[10];
> 
> I would make this bigger just in case i comes bigger by some reason.
> 16 or 20 looks reasonable.
> 
made 20



-- 
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project