Re: [PATCH] scsi: hisi_sas: Fix build error without SATA_HOST

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On 2020/4/2 15:30, John Garry wrote:
> On 02/04/2020 07:30, YueHaibing wrote:
> 
> +
> 
>> If SATA_HOST is n, build fails:
>>
>> drivers/scsi/hisi_sas/hisi_sas_main.o: In function `hisi_sas_fill_ata_reset_cmd':
>> hisi_sas_main.c:(.text+0x2500): undefined reference to `ata_tf_to_fis'
>>
>> Select SATA_HOST to fix this.
>>
>> Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
>> Fixes: 7c594f0407de ("scsi: hisi_sas: add softreset function for SATA disk")
> 
> That's not right. SATA_HOST was only introduced recently in the ATA code. It would fix those kconfig changes.

Ok, thanks

> 
>> Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
>> ---
>>   drivers/scsi/hisi_sas/Kconfig | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/scsi/hisi_sas/Kconfig b/drivers/scsi/hisi_sas/Kconfig
>> index 90a17452a50d..13ed9073fc72 100644
>> --- a/drivers/scsi/hisi_sas/Kconfig
>> +++ b/drivers/scsi/hisi_sas/Kconfig
>> @@ -6,6 +6,7 @@ config SCSI_HISI_SAS
>>       select SCSI_SAS_LIBSAS
>>       select BLK_DEV_INTEGRITY
>>       depends on ATA
>> +    select SATA_HOST
> 
> That does not feel right.
> 
> SCSI_HISI_SAS depends on ATA, but SATA_HOST also depends on ATA, so it seems better to just depend on SATA_HOST (and omit explicit ATA dependency), rather than select it.

Depends on SATA_HOST will result int this:

scripts/kconfig/mconf  Kconfig
drivers/scsi/hisi_sas/Kconfig:2:error: recursive dependency detected!
drivers/scsi/hisi_sas/Kconfig:2:        symbol SCSI_HISI_SAS depends on SATA_HOST
drivers/ata/Kconfig:37: symbol SATA_HOST is selected by SCSI_SAS_ATA
drivers/scsi/libsas/Kconfig:18: symbol SCSI_SAS_ATA depends on SCSI_SAS_LIBSAS
drivers/scsi/libsas/Kconfig:9:  symbol SCSI_SAS_LIBSAS is selected by SCSI_HISI_SAS
For a resolution refer to Documentation/kbuild/kconfig-language.rst
subsection "Kconfig recursive dependency limitations"


All users of SATA_HOST have the 'select' statement, so we should do the same here.

> 
> Thanks,
> John
> 
> .
> 




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