linux-kernel - Re: [PATCH V2 3/4] [SCSI] ufs: Add Platform glue driver for ufshcd

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Date:	Tue, 17 Jul 2012 11:39:49 +0530
From:	vinayak holikatti <vinholikatti@...il.com>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	James.Bottomley@...senpartnership.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, patches@...aro.org,
	linux-samsung-soc@...r.kernel.org, santoshsy@...il.com,
	arnd@...aro.org, girish.shivananjappa@...aro.org,
	saugata.das@...aro.org, vishak.g@...sung.com, venkat@...aro.org,
	k.rajesh@...sung.com, dsaxena@...aro.org, ilho215.lee@...sung.com,
	nala.la@...sung.com, sreekumar.c@...sung.com
Subject: Re: [PATCH V2 3/4] [SCSI] ufs: Add Platform glue driver for ufshcd

On Mon, Jul 16, 2012 at 7:19 PM, Namjae Jeon <linkinjeon@...il.com> wrote:
> Hi Vinayak.
>> + * ufshcd_pltfrm_remove - remove platform driver routine
>> + * @pdev: pointer to platform device handle
>> + *
>> + * Returns 0 on success, non-zero value on failure
>> + */
>> +static int __devexit ufshcd_pltfrm_remove(struct platform_device *pdev)
>> +{
>> +     struct resource *mem_res;
>> +     struct resource *irq_res;
>> +     resource_size_t mem_size;
>> +     struct ufs_hba *hba =  platform_get_drvdata(pdev);
>> +
>> +     ufshcd_remove(hba);
>> +     irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> +     if (!irq_res)
>> +             dev_err(&pdev->dev, "ufshcd: IRQ resource not available\n");
>> +     free_irq(irq_res->start, hba);
> Is there no possibility of null pointer dereferencing error ?(irq_res->start)
> I think that free_irq should be not called if irq_res is NULL.
I agree, I have overlooked at this logic, the free_irq should have
been in the else
part of this section. I will make the modification in the next version
of patches.
>> +     mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> Looks mem_res is also same with upper case.
> Thanks.
>> +     mem_size = resource_size(mem_res);
>> +     release_mem_region(mem_res->start, mem_size);
>> +     platform_set_drvdata(pdev, NULL);
>> +     return 0;
>> +}
>> +
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