linux-kernel - Re: [2.6 patch] SCSI_AIC94XX must depend on SCSI

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Date:	Thu, 06 Mar 2008 15:32:06 -0600
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Adrian Bunk <bunk@...nel.org>,
	Toralf Förster <toralf.foerster@....de>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [2.6 patch] SCSI_AIC94XX must depend on SCSI

On Thu, 2008-03-06 at 12:35 -0800, Darrick J. Wong wrote:
> On Thu, Mar 06, 2008 at 10:22:46PM +0200, Adrian Bunk wrote:
> > This patch fixes the following build error reported by Toralf Förster:
> > 
> > <--  snip  -->
> > 
> > ...
> >   MODPOST 243 modules
> > ERROR: "sas_bios_param" [drivers/scsi/mvsas.ko] undefined!
> 
> <snip>
> 
> > --- a/drivers/scsi/aic94xx/Kconfig
> > +++ b/drivers/scsi/aic94xx/Kconfig
> 
> Maybe I'm missing something here, but how does patching aic94xx Kconfig
> fix an mvsas build problem?

Actually, it's a dependency chain fault.  The config this was generated
from has

CONFIG_SCSI=m

CONFIG_SCSI_AIC94XX=y

the latter then forces

CONFIG_SCSI_SAS_LIBSAS=y

I think the error reported is wrong: the kernel just should have failed
to link, since both the built in aic94xx and libsas have scsi
dependencies.

We have a few other drivers in this category (like ibmvscsi).  The root
cause seems to be that SCSI_LOWLEVEL doesn't act as a tristate.  I think
a fix that will prevent all of these issues from recurring is this one.

James


---

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index c46666a..b9d3740 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -325,7 +325,7 @@ menuconfig SCSI_LOWLEVEL
 	depends on SCSI!=n
 	default y
 
-if SCSI_LOWLEVEL
+if SCSI_LOWLEVEL && SCSI
 
 config ISCSI_TCP
 	tristate "iSCSI Initiator over TCP/IP"


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