linux-kernel - [ 053/127] SCSI: mpt2sas: Fix for issue - Unable to boot from the drive connected to HBA

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Date:	Fri, 28 Sep 2012 13:33:46 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Sreekanth Reddy <sreekanth.reddy@....com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [ 053/127] SCSI: mpt2sas: Fix for issue - Unable to boot from the drive connected to HBA

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "sreekanth.reddy@....com" <sreekanth.reddy@....com>

commit 10cce6d8b5af0b32bc4254ae4a28423a74c0921c upstream.

This patch checks whether HBA is SAS2008 B0 controller.
if it is a SAS2008 B0 controller then it use IO-APIC interrupt instead of MSIX,
as SAS2008 B0 controller doesn't support MSIX interrupts.

[jejb: fix whitespace problems]
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@....com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/mpt2sas/mpt2sas_base.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -1097,6 +1097,13 @@ _base_check_enable_msix(struct MPT2SAS_A
 	u16 message_control;
 
 
+	/* Check whether controller SAS2008 B0 controller,
+	   if it is SAS2008 B0 controller use IO-APIC instead of MSIX */
+	if (ioc->pdev->device == MPI2_MFGPAGE_DEVID_SAS2008 &&
+	    ioc->pdev->revision == 0x01) {
+		return -EINVAL;
+	}
+
 	base = pci_find_capability(ioc->pdev, PCI_CAP_ID_MSIX);
 	if (!base) {
 		dfailprintk(ioc, printk(MPT2SAS_INFO_FMT "msix not "


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