[SCSI] libsas: make ATA functions selectable by a config option

Not everyone wants libsas automatically to pull in libata.  This patch
makes the behaviour configurable, so you can build libsas with or
without ATA support.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/libsas/Kconfig

@@ -30,6 +30,13 @@ config SCSI_SAS_LIBSAS
 	  This provides transport specific helpers for SAS drivers which
 	  use the domain device construct (like the aic94xxx).
 
+config SCSI_SAS_ATA
+	bool "ATA support for libsas (requires libata)"
+	depends on SCSI_SAS_LIBSAS && ATA
+	help
+		Builds in ATA support into libsas.  Will necessitate
+		the loading of libata along with libsas.
+
 config SCSI_SAS_LIBSAS_DEBUG
 	bool "Compile the SAS Domain Transport Attributes in debug mode"
 	default y

drivers/scsi/libsas/Makefile

@@ -33,5 +33,5 @@ libsas-y +=  sas_init.o     \
 		sas_dump.o     \
 		sas_discover.o \
 		sas_expander.o \
-		sas_scsi_host.o \
-		sas_ata.o
+		sas_scsi_host.o
+libsas-$(CONFIG_SCSI_SAS_ATA) +=	sas_ata.o

drivers/scsi/libsas/sas_expander.c

@@ -535,6 +535,8 @@ int sas_smp_get_phy_events(struct sas_phy *phy)
 
 }
 
+#ifdef CONFIG_SCSI_SAS_ATA
+
 #define RPS_REQ_SIZE  16
 #define RPS_RESP_SIZE 60
 
@@ -578,6 +580,7 @@ static int sas_get_report_phy_sata(struct domain_device *dev,
 	kfree(rps_req);
 	return res;
 }
+#endif
 
 static void sas_ex_get_linkrate(struct domain_device *parent,
 				       struct domain_device *child,
@@ -645,6 +648,7 @@ static struct domain_device *sas_ex_discover_end_dev(
 	}
 	sas_ex_get_linkrate(parent, child, phy);
 
+#ifdef CONFIG_SCSI_SAS_ATA
 	if ((phy->attached_tproto & SAS_PROTO_STP) || phy->attached_sata_dev) {
 		child->dev_type = SATA_DEV;
 		if (phy->attached_tproto & SAS_PROTO_STP)
@@ -682,7 +686,9 @@ static struct domain_device *sas_ex_discover_end_dev(
 				    SAS_ADDR(parent->sas_addr), phy_id, res);
 			goto out_list_del;
 		}
-	} else if (phy->attached_tproto & SAS_PROTO_SSP) {
+	} else
+#endif
+	  if (phy->attached_tproto & SAS_PROTO_SSP) {
 		child->dev_type = SAS_END_DEV;
 		rphy = sas_end_device_alloc(phy->port);
 		/* FIXME: error handling */
@@ -710,6 +716,7 @@ static struct domain_device *sas_ex_discover_end_dev(
 		SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 			    phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 			    phy_id);
+		goto out_free;
 	}
 
 	list_add_tail(&child->siblings, &parent_ex->children);

include/scsi/sas_ata.h

@@ -28,6 +28,8 @@
 #include <linux/libata.h>
 #include <scsi/libsas.h>
 
+#ifdef CONFIG_SCSI_SAS_ATA
+
 static inline int dev_is_sata(struct domain_device *dev)
 {
 	return (dev->rphy->identify.target_port_protocols & SAS_PROTOCOL_SATA);
@@ -38,4 +40,21 @@ int sas_ata_init_host_and_port(struct domain_device *found_dev,
 
 void sas_ata_task_abort(struct sas_task *task);
 
+#else
+
+
+static inline int dev_is_sata(struct domain_device *dev)
+{
+	return 0;
+}
+int sas_ata_init_host_and_port(struct domain_device *found_dev,
+			       struct scsi_target *starget)
+{
+	return 0;
+}
+void sas_ata_task_abort(struct sas_task *task)
+{
+}
+#endif
+
 #endif /* _SAS_ATA_H_ */