linux-kernel - Re: [PATCH] scsi: mpi3mr: add explicit dependency on CONFIG_SCSI_SAS

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Date:   Mon, 17 Oct 2022 10:13:58 -0400
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Michal Kubecek <mkubecek@...e.cz>,
        mpi3mr-linuxdrv.pdl@...adcom.com,
        Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: mpi3mr: add explicit dependency on
 CONFIG_SCSI_SAS_ATTRS

On Mon, 2022-10-17 at 16:05 +0200, Michal Kubecek wrote:
> Starting with commit 42fc9fee116f ("scsi: mpi3mr: Add helper
> functions to
> manage device's port"), kernel configured with CONFIG_SCSI_MPI3MR=m
> and
> CONFIG_SCSI_SAS_ATTRS=n fails to build because modpost cannot find
> symbols
> used in mpi3mr_transport.c:
> 
>   ERROR: modpost: "sas_port_alloc_num"
> [drivers/scsi/mpi3mr/mpi3mr.ko] undefined!
>   ERROR: modpost: "sas_remove_host" [drivers/scsi/mpi3mr/mpi3mr.ko]
> undefined!
>   ERROR: modpost: "sas_phy_alloc" [drivers/scsi/mpi3mr/mpi3mr.ko]
> undefined!
>   ERROR: modpost: "sas_phy_free" [drivers/scsi/mpi3mr/mpi3mr.ko]
> undefined!
>   ...
> 
> Add an explicit dependency of CONFIG_SCSI_MPI3MR on
> CONFIG_SCSI_SAS_ATTRS
> to prevent inconsistent configs.
> 
> Fixes: 42fc9fee116f ("scsi: mpi3mr: Add helper functions to manage
> device's port")
> Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
> ---
>  drivers/scsi/mpi3mr/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/mpi3mr/Kconfig
> b/drivers/scsi/mpi3mr/Kconfig
> index 8997531940c2..8ada8e8d25ac 100644
> --- a/drivers/scsi/mpi3mr/Kconfig
> +++ b/drivers/scsi/mpi3mr/Kconfig
> @@ -2,7 +2,7 @@
>  
>  config SCSI_MPI3MR
>  	tristate "Broadcom MPI3 Storage Controller Device Driver"
> -	depends on PCI && SCSI
> +	depends on PCI && SCSI && SCSI_SAS_ATTRS

This should probably be select not depends.

All transport attributes are designed to be selected.  The reason is to
avoid people having to figure out what attributes they have to set in
Kconfig before they see the HBAs they're interested in.

James