linux-kernel - Re: [PATCH] iommu/qcom:fix local

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Message-ID: <252fecfd-28bc-7331-c17e-70032cdb980e@cmss.chinamobile.com>
Date:   Thu, 16 Apr 2020 18:12:56 +0800
From:   Tang Bin <tangbin@...s.chinamobile.com>
To:     Robin Murphy <robin.murphy@....com>, agross@...nel.org,
        bjorn.andersson@...aro.org, robdclark@...il.com
Cc:     linux-arm-msm@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/qcom:fix local_base status check


On 2020/4/16 18:05, Robin Murphy wrote:
> On 2020-04-02 7:33 am, Tang Bin wrote:
>> Release resources when exiting on error.
>>
>> Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
>> ---
>>   drivers/iommu/qcom_iommu.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
>> index 4328da0b0..c08aa9651 100644
>> --- a/drivers/iommu/qcom_iommu.c
>> +++ b/drivers/iommu/qcom_iommu.c
>> @@ -813,8 +813,11 @@ static int qcom_iommu_device_probe(struct 
>> platform_device *pdev)
>>       qcom_iommu->dev = dev;
>>         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -    if (res)
>> +    if (res) {
>>           qcom_iommu->local_base = devm_ioremap_resource(dev, res);
>> +        if (IS_ERR(qcom_iommu->local_base))
>> +            return PTR_ERR(qcom_iommu->local_base);
>> +    }
>
> ...or just use devm_platform_ioremap_resource() to make the whole 
> thing simpler.
Yes, I was going to simplify the code here, but status check is still 
required.

So I'm waiting.

Thanks,

Tang Bin