libata: separate out ata_dev_reread_id()

Separate out ata_dev_reread_id() from ata_dev_revalidate().
ata_dev_reread_id() reads IDENTIFY page and determines whether the
same device is still there.  ata_dev_revalidate() reconfigures after
reread completes.  This will be used by ACPI update.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

2 files changed, 36 insertions, 14 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 4166407eb47..6f266c8179e 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3675,8 +3675,8 @@ static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
 }
 
 /**
- *      ata_dev_revalidate - Revalidate ATA device
- *      @dev: device to revalidate
+ *      ata_dev_reread_id - Re-read IDENTIFY data
+ *      @adev: target ATA device
  *      @readid_flags: read ID flags
  *
  *      Re-read IDENTIFY page and make sure @dev is still attached to
@@ -3688,29 +3688,50 @@ static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
  *      RETURNS:
  *      0 on success, negative errno otherwise
  */
-int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
+int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
 {
         unsigned int class = dev->class;
         u16 *id = (void *)dev->ap->sector_buf;
         int rc;
 
-        if (!ata_dev_enabled(dev)) {
-                rc = -ENODEV;
-                goto fail;
-        }
-
         /* read ID data */
         rc = ata_dev_read_id(dev, &class, readid_flags, id);
         if (rc)
-                goto fail;
+                return rc;
 
         /* is the device still there? */
-        if (!ata_dev_same_device(dev, class, id)) {
-                rc = -ENODEV;
-                goto fail;
-        }
+        if (!ata_dev_same_device(dev, class, id))
+                return -ENODEV;
 
         memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
+        return 0;
+}
+
+/**
+ *      ata_dev_revalidate - Revalidate ATA device
+ *      @dev: device to revalidate
+ *      @readid_flags: read ID flags
+ *
+ *      Re-read IDENTIFY page, make sure @dev is still attached to the
+ *      port and reconfigure it according to the new IDENTIFY page.
+ *
+ *      LOCKING:
+ *      Kernel thread context (may sleep)
+ *
+ *      RETURNS:
+ *      0 on success, negative errno otherwise
+ */
+int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
+{
+        int rc;
+
+        if (!ata_dev_enabled(dev))
+                return -ENODEV;
+
+        /* re-read ID */
+        rc = ata_dev_reread_id(dev, readid_flags);
+        if (rc)
+                goto fail;
 
         /* configure device according to the new ID */
         rc = ata_dev_configure(dev);
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 8b71b73a199..13cb0c9af68 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -76,7 +76,8 @@ extern unsigned ata_exec_internal_sg(struct ata_device *dev,
 extern unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd);
 extern int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
                            unsigned int flags, u16 *id);
-extern int ata_dev_revalidate(struct ata_device *dev, unsigned int flags);
+extern int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags);
+extern int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags);
 extern int ata_dev_configure(struct ata_device *dev);
 extern int sata_down_spd_limit(struct ata_port *ap);
 extern int sata_set_spd_needed(struct ata_port *ap);