[SCSI] hpsa: enable unit attention reporting

This used to be the default, but at some point the firmware guys
changed the default and I failed to notice.  Now to get unit
attention notifications, you must twiddle a bit indicating you
want them.
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/hpsa.c

@@ -4384,14 +4384,15 @@ static inline bool hpsa_CISS_signature_present(struct ctlr_info *h)
 
 static inline void hpsa_set_driver_support_bits(struct ctlr_info *h)
 {
-#ifdef CONFIG_X86
-	/* Need to enable prefetch in the SCSI core for 6400 in x86 */
 	u32 driver_support;
 
+#ifdef CONFIG_X86
+	/* Need to enable prefetch in the SCSI core for 6400 in x86 */
 	driver_support = readl(&(h->cfgtable->driver_support));
 	driver_support |= ENABLE_SCSI_PREFETCH;
-	writel(driver_support, &(h->cfgtable->driver_support));
 #endif
+	driver_support |= ENABLE_UNIT_ATTN;
+	writel(driver_support, &(h->cfgtable->driver_support));
 }
 
 /* Disable DMA prefetch for the P600.  Otherwise an ASIC bug may result

drivers/scsi/hpsa_cmd.h

@@ -358,6 +358,7 @@ struct CfgTable {
 	u32           HeartBeat;
 	u32           driver_support;
 #define			ENABLE_SCSI_PREFETCH 0x100
+#define			ENABLE_UNIT_ATTN 0x01
 	u32	 	MaxScatterGatherElements;
 	u32		MaxLogicalUnits;
 	u32		MaxPhysicalDevices;