linux: Update to v4.2.1-openpower1

This brings in the 4.2.1 stable release, and the accraid RAID driver for
PMC-Sierra RAID  on Habanero.

The RAID driver is submitted upstream to the linux-scsi mailing list,
but is not yet in a tree.

The stable release brings in a few commits that are of interest to
OpenPower platforms:

 94d718d024e xfs: return errors from partial I/O failures to files
 2937b784b19 xfs: Fix file type directory corruption for btree directories
 95310b79776 libxfs: readahead of dir3 data blocks should use the read verifier
 0a3b19cef4f sched: Fix cpu_active_mask/cpu_online_mask race

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/linux/linux-0017-aacraid-Update-driver-version.patch b/openpower/linux/linux-0017-aacraid-Update-driver-version.patch
new file mode 100644
index 0000000..09345a3
--- /dev/null
+++ b/openpower/linux/linux-0017-aacraid-Update-driver-version.patch
@@ -0,0 +1,30 @@
+From f11a9348cf2abcc11bc1b98a9976d73107df88b0 Mon Sep 17 00:00:00 2001
+From: Mahesh Rajashekhara <Mahesh.Rajashekhara@pmcs.com>
+Date: Fri, 28 Aug 2015 06:38:41 -0400
+Subject: [PATCH 17/18] aacraid: Update driver version
+
+Reviewed-by: Tomas Henzl <thenzl@redhat.com>
+Reviewed-by: Murthy Bhat <Murthy.Bhat@pmcs.com>
+Reviewed-by: Karthikeya Sunkesula <Karthikeya.Sunkesula@pmcs.com>
+Signed-off-by: Mahesh Rajashekhara <Mahesh.Rajashekhara@pmcs.com>
+Signed-off-by: Joel Stanley <joel@jms.id.au>
+---
+ drivers/scsi/aacraid/aacraid.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
+index 2de5ebc..074878b 100644
+--- a/drivers/scsi/aacraid/aacraid.h
++++ b/drivers/scsi/aacraid/aacraid.h
+@@ -62,7 +62,7 @@ enum {
+ #define	PMC_GLOBAL_INT_BIT0		0x00000001
+ 
+ #ifndef AAC_DRIVER_BUILD
+-# define AAC_DRIVER_BUILD 40709
++# define AAC_DRIVER_BUILD 41010
+ # define AAC_DRIVER_BRANCH "-ms"
+ #endif
+ #define MAXIMUM_NUM_CONTAINERS	32
+-- 
+2.5.0
+