linux-kernel - Re: MPT2SAS boot fail... due to silently loosing the driver

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Message-ID: <yq1wpt7li62.fsf@sermon.lab.mkp.net>
Date:	Tue, 24 Nov 2015 07:02:13 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Sreekanth.Reddy@...gotech.com, mingo@...nel.org, hch@....de,
	hare@...e.de, martin.petersen@...cle.com,
	linux-kernel@...r.kernel.org
Subject: Re: MPT2SAS boot fail... due to silently loosing the driver

>>>>> "Peter" == Peter Zijlstra <peterz@...radead.org> writes:

Peter> Please either create a fake MPT2SAS config that selects the
Peter> MPT3SAS driver, or rename the whole thing to MPT23SAS such that
Peter> we at least get a relevant question on oldconfig.

Sorry about that, Peter.

I get bitten by oldconfig all the time so I have a script to manage all
my configs. But it it would be nice if we had a way to express config
options transitions in kbuild.

I guess we could do something like the following and let it sit for a
release cycle to help people transition. Bit of a hack, but it worked
for me in my quick testing...

-- 
Martin K. Petersen	Oracle Linux Engineering

diff --git a/drivers/scsi/mpt3sas/Kconfig b/drivers/scsi/mpt3sas/Kconfig
index 29061467cc17..901c97f1e368 100644
--- a/drivers/scsi/mpt3sas/Kconfig
+++ b/drivers/scsi/mpt3sas/Kconfig
@@ -48,6 +48,13 @@ config SCSI_MPT3SAS
 	---help---
 	This driver supports PCI-Express SAS 12Gb/s Host Adapters.
 
+config SCSI_MPT2SAS
+	tristate
+	default n
+	select SCSI_MPT3SAS
+	---help---
+	Dummy config option for backwards compatiblity.
+
 config SCSI_MPT2SAS_MAX_SGE
 	int "LSI MPT Fusion SAS 2.0 Max number of SG Entries (16 - 256)"
 	depends on PCI && SCSI && SCSI_MPT3SAS

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