libata-sff: introduce ata_sff_init/exit() and ata_sff_port_init()

In preparation of proper SFF/BMDMA separation, introduce
ata_sff_init/exit() and ata_sff_port_init().  These functions
currently don't do anything.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

3 files changed, 50 insertions, 6 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index cc49a0d3089f..200f49d09228 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5670,6 +5670,8 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
         ap->stats.unhandled_irq = 1;
         ap->stats.idle_irq = 1;
 #endif
+        ata_sff_port_init(ap);
+
         return ap;
 }
 
@@ -6584,6 +6586,8 @@ static void __init ata_parse_force_param(void)
 
 static int __init ata_init(void)
 {
+        int rc = -ENOMEM;
+
         ata_parse_force_param();
 
         /*
@@ -6595,24 +6599,31 @@ static int __init ata_init(void)
          */
         ata_wq = create_workqueue("ata");
         if (!ata_wq)
-                goto free_force_tbl;
+                goto fail;
 
         ata_aux_wq = create_singlethread_workqueue("ata_aux");
         if (!ata_aux_wq)
-                goto free_wq;
+                goto fail;
+
+        rc = ata_sff_init();
+        if (rc)
+                goto fail;
 
         printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
         return 0;
 
-free_wq:
-        destroy_workqueue(ata_wq);
-free_force_tbl:
+fail:
         kfree(ata_force_tbl);
-        return -ENOMEM;
+        if (ata_wq)
+                destroy_workqueue(ata_wq);
+        if (ata_aux_wq)
+                destroy_workqueue(ata_aux_wq);
+        return rc;
 }
 
 static void __exit ata_exit(void)
 {
+        ata_sff_exit();
         kfree(ata_force_tbl);
         destroy_workqueue(ata_wq);
         destroy_workqueue(ata_aux_wq);
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index f1c99a3e8b2c..4a3d1f214457 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -3061,3 +3061,26 @@ void ata_pci_bmdma_init(struct ata_host *host)
 EXPORT_SYMBOL_GPL(ata_pci_bmdma_init);
 
 #endif /* CONFIG_PCI */
+
+/**
+ *      ata_sff_port_init - Initialize SFF/BMDMA ATA port
+ *      @ap: Port to initialize
+ *
+ *      Called on port allocation to initialize SFF/BMDMA specific
+ *      fields.
+ *
+ *      LOCKING:
+ *      None.
+ */
+void ata_sff_port_init(struct ata_port *ap)
+{
+}
+
+int __init ata_sff_init(void)
+{
+        return 0;
+}
+
+void __exit ata_sff_exit(void)
+{
+}
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 132da80aa23a..d89502f3123a 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -203,6 +203,16 @@ static inline int sata_pmp_attach(struct ata_device *dev)
 /* libata-sff.c */
 #ifdef CONFIG_ATA_SFF
 extern void ata_pio_task(struct work_struct *work);
+extern void ata_sff_port_init(struct ata_port *ap);
+extern int ata_sff_init(void);
+extern void ata_sff_exit(void);
+#else /* CONFIG_ATA_SFF */
+static inline void ata_sff_port_init(struct ata_port *ap)
+{ }
+static inline int ata_sff_init(void)
+{ return 0; }
+static inline void ata_sff_exit(void)
+{ }
 #endif /* CONFIG_ATA_SFF */
 
 #endif /* __LIBATA_H__ */