linux-kernel - Re: [PATCH v2 3/5] soc: qcom: smem: Support global partition

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Date:   Fri, 15 Sep 2017 14:02:03 -0700
From:   Chris Lew <clew@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     andy.gross@...aro.org, david.brown@...aro.org,
        aneela@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] soc: qcom: smem: Support global partition



On 9/15/2017 11:33 AM, Bjorn Andersson wrote:
> On Thu 14 Sep 14:25 PDT 2017, Chris Lew wrote:
> 
> [..]
>> +static struct smem_ptable *qcom_smem_get_ptable(struct qcom_smem *smem)
>>   {
>> -	struct smem_partition_header *header;
>> -	struct smem_ptable_entry *entry;
>>   	struct smem_ptable *ptable;
>> -	unsigned remote_host;
>> -	u32 version, host0, host1;
>> -	int i;
>> +	u32 version;
>>   
>>   	ptable = smem->regions[0].virt_base + smem->regions[0].size - SZ_4K;
>>   	if (memcmp(ptable->magic, SMEM_PTABLE_MAGIC, sizeof(ptable->magic)))
>> -		return 0;
>> +		return NULL;
>>   
>>   	version = le32_to_cpu(ptable->version);
>>   	if (version != 1) {
>>   		dev_err(smem->dev,
>>   			"Unsupported partition header version %d\n", version);
>> +		return ERR_PTR(-EINVAL);
> 
> In the calling places NULL and -EINVAL are both treated as -EINVAL, so I
> think it's better to just return NULL here as well as check for !ptable
> in callers.
> 
> Regards,
> Bjorn
> 

qcom_smem_enumerate_partitions allowed the partition table to be 
optional before. I want to keep that behavior for V11 where smem might 
only have the global heap. The probe will continue with a NULL/0 return 
from qcom_get_ptable/qcom_smem_enumerate_partitions.

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