Re: [PATCH v1 12/17] scsi: ufs: add retry for query descriptors

[ygardi@codeaurora.org]

> 2015-09-13 23:52 GMT+09:00 Yaniv Gardi <ygardi@codeaurora.org>:
>> Query commands have 100ms timeout and it may timeout if they are
>> issued in parallel to ongoing read/write SCSI commands, this change
>> adds the retry (max: 10) in case command timeouts.
>>
>> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
>> Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
>>
>> ---
>>  drivers/scsi/ufs/ufshcd.c | 48
>> ++++++++++++++++++++++++++++++++---------------
>>  1 file changed, 33 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index a649250..528e46e 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -1906,21 +1906,7 @@ static int ufshcd_query_attr_retry(struct ufs_hba
>> *hba,
>>         return ret;
>>  }
>>
>> -/**
>> - * ufshcd_query_descriptor - API function for sending descriptor
>> requests
>> - * hba: per-adapter instance
>> - * opcode: attribute opcode
>> - * idn: attribute idn to access
>> - * index: index field
>> - * selector: selector field
>> - * desc_buf: the buffer that contains the descriptor
>> - * buf_len: length parameter passed to the device
>> - *
>> - * Returns 0 for success, non-zero in case of failure.
>> - * The buf_len parameter will contain, on return, the length parameter
>> - * received on the response.
>> - */
>> -static int ufshcd_query_descriptor(struct ufs_hba *hba,
>> +static int __ufshcd_query_descriptor(struct ufs_hba *hba,
>>                         enum query_opcode opcode, enum desc_idn idn, u8
>> index,
>>                         u8 selector, u8 *desc_buf, int *buf_len)
>>  {
>> @@ -1985,6 +1971,38 @@ out:
>>  }
>>
>>  /**
>> + * ufshcd_query_descriptor - API function for sending descriptor
>> requests
>> + * hba: per-adapter instance
>> + * opcode: attribute opcode
>> + * idn: attribute idn to access
>> + * index: index field
>> + * selector: selector field
>> + * desc_buf: the buffer that contains the descriptor
>> + * buf_len: length parameter passed to the device
>> + *
>> + * Returns 0 for success, non-zero in case of failure.
>> + * The buf_len parameter will contain, on return, the length parameter
>> + * received on the response.
>> + */
>> +int ufshcd_query_descriptor(struct ufs_hba *hba,
>> +                       enum query_opcode opcode, enum desc_idn idn, u8
>> index,
>> +                       u8 selector, u8 *desc_buf, int *buf_len)
>> +{
>> +       int err;
>> +       int retries;
>> +
>> +       for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
>> +               err = __ufshcd_query_descriptor(hba, opcode, idn, index,
>> +                                               selector, desc_buf,
>> buf_len);
>> +               if (!err || err == -EINVAL)
>> +                       break;
>> +       }
>> +
>> +       return err;
>> +}
>> +EXPORT_SYMBOL(ufshcd_query_descriptor);
>
> You introduced query flag and attribute APIs for retry version with
> '_retry' suffix.
> This function retries but doesn't have '_retry' suffix.
> Should we have consistent function names for these query APIs?
>

sure. will fix this in v2