[PATCH 04/12] libata: implement ata_all_ports list

[Tejun Heo <htejun@gmail.com>]

Implement ata_all_ports list.  All active ata_ports are linked on this
list.  This will be used to dynamically modify libata-wide
configurations.

Signed-off-by: Tejun Heo <htejun@gmail.com>

---

 drivers/scsi/libata-core.c |   13 +++++++++++++
 include/linux/libata.h     |    2 ++
 2 files changed, 15 insertions(+), 0 deletions(-)

a962488760934f639dd202793694339afd2db1cf
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 61db4f5..1477d32 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -70,6 +70,9 @@ static unsigned int ata_dev_init_params(
 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
 static void ata_dev_xfermask(struct ata_device *dev);
 
+static DEFINE_MUTEX(ata_all_ports_mutex);
+static LIST_HEAD(ata_all_ports);
+
 static unsigned int ata_unique_id = 1;
 static struct workqueue_struct *ata_wq;
 
@@ -5464,6 +5467,11 @@ int ata_device_add(const struct ata_prob
 
 		ap = host_set->ports[i];
 
+		/* this port is active now, add it to all_ports */
+		mutex_lock(&ata_all_ports_mutex);
+		list_add_tail(&ap->all_ports_entry, &ata_all_ports);
+		mutex_unlock(&ata_all_ports_mutex);
+
 		/* init sata_spd_limit to the current value */
 		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
 			int spd = (scontrol >> 4) & 0xf;
@@ -5594,6 +5602,11 @@ void ata_port_detach(struct ata_port *ap
 	cancel_delayed_work(&ap->hotplug_task);
 	flush_workqueue(ata_aux_wq);
 
+	/* this port is dead now, remove from all_ports */
+	mutex_lock(&ata_all_ports_mutex);
+	list_del_init(&ap->all_ports_entry);
+	mutex_unlock(&ata_all_ports_mutex);
+
 	/* remove the associated SCSI host */
 	scsi_remove_host(ap->host);
 }
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 66c3100..c9ed035 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -555,6 +555,8 @@ struct ata_port {
 	pm_message_t		pm_mesg;
 	int			*pm_result;
 
+	struct list_head	all_ports_entry;
+
 	void			*private_data;
 
 	u8			sector_buf[ATA_SECT_SIZE]; /* owned by EH */
-- 
1.3.2