linux-kernel - [PATCH] hpsa: fix uninitialized trans_support in hpsa_put_ctlr_into_performant

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Date:	Thu, 10 Apr 2014 17:17:04 -0500
From:	scameron@...rdog.cce.hp.com
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Davidlohr Bueso <davidlohr@...com>,
	Baoquan He <bhe@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Joerg Roedel <joro@...tes.org>,
	"open list:INTEL IOMMU (VT-d)" <iommu@...ts.linux-foundation.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	scameron@...rdog.cce.hp.com
Subject: [PATCH] hpsa: fix uninitialized trans_support in hpsa_put_ctlr_into_performant_mode()


Without this, you'll see a null pointer dereference in
hpsa_enter_performant_mode().

Signed-off-by: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
---
 drivers/scsi/hpsa.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 8cf4a0c..ef4dfdd 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -7463,6 +7463,10 @@ static void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h)
 	if (hpsa_simple_mode)
 		return;
 
+	trans_support = readl(&(h->cfgtable->TransportSupport));
+	if (!(trans_support & PERFORMANT_MODE))
+		return;
+
 	/* Check for I/O accelerator mode support */
 	if (trans_support & CFGTBL_Trans_io_accel1) {
 		transMethod |= CFGTBL_Trans_io_accel1 |
-- 
1.7.1

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