linux-kernel - Re: [PATCH] scsi: hisi_sas: fix SATA dependency

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Date:   Tue, 28 Mar 2017 17:48:23 +0100
From:   John Garry <john.garry@...wei.com>
To:     Arnd Bergmann <arnd@...db.de>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
CC:     Xiang Chen <chenxiang66@...ilicon.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: hisi_sas: fix SATA dependency

On 28/03/2017 15:22, Arnd Bergmann wrote:
> Removing the 'select SCSI_SAS_LIBSAS' statement in Kconfig resulted
> in a link failure in configurations that have hisi_sas built-in
> but libsas as a loadable module:
>
> drivers/scsi/built-in.o: In function `hisi_sas_scan_finished':
> hisi_sas_main.c:(.text+0x37ce9): undefined reference to `sas_drain_work'
> drivers/scsi/built-in.o: In function `hisi_sas_slave_configure':
> hisi_sas_main.c:(.text+0x37d17): undefined reference to `sas_slave_configure'
> hisi_sas_main.c:(.text+0x37d40): undefined reference to `sas_change_queue_depth'
> drivers/scsi/built-in.o: In function `hisi_sas_remove':
>
> All other libsas users have the 'select' statement, so we should do the
> same here for consistency. For all I can tell, the patch that added
> the sata softreset does not actually introduce a dependency on SCSI_SAS_ATA
> but instead adds calls into libata itself, so we can express that with
> a more specific dependency.
>
> We cannot have 'select SCSI_SAS_LIBSAS; depends on SCSI_SAS_ATA' as that
> would cause a dependency loop.
>

Hi Arnd,

Thanks for the fix. So we missed that SCSI_SAS_ATA is a bool and not a 
tristate, like SCSI_SAS_LIBSAS. Just adding the dependency on ATA is better.


> Fixes: 7c594f0407de ("scsi: hisi_sas: add softreset function for SATA disk")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Signed-off-by: John Garry <john.garry@...wei.com>

> ---
>  drivers/scsi/hisi_sas/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/hisi_sas/Kconfig b/drivers/scsi/hisi_sas/Kconfig
> index ded2c201071d..374a329b91fc 100644
> --- a/drivers/scsi/hisi_sas/Kconfig
> +++ b/drivers/scsi/hisi_sas/Kconfig
> @@ -2,7 +2,8 @@ config SCSI_HISI_SAS
>  	tristate "HiSilicon SAS"
>  	depends on HAS_DMA && HAS_IOMEM
>  	depends on ARM64 || COMPILE_TEST
> -	depends on SCSI_SAS_ATA
> +	select SCSI_SAS_LIBSAS
>  	select BLK_DEV_INTEGRITY
> +	depends on ATA
>  	help
>  		This driver supports HiSilicon's SAS HBA
>