[PATCH] libata: separate out ata_id_major_version()

Separate out ATA major version calculation from ata_dev_identify()
into ata_id_major_version().  It's preparation for splitting
ata_dev_identify().

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/ata.h b/include/linux/ata.h
index a8155ca4947f..b02a16c435e7 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -267,6 +267,16 @@ struct ata_taskfile {
           ((u64) (id)[(n) + 1] << 16) | \
           ((u64) (id)[(n) + 0]) )
 
+static inline unsigned int ata_id_major_version(const u16 *id)
+{
+        unsigned int mver;
+
+        for (mver = 14; mver >= 1; mver--)
+                if (id[ATA_ID_MAJOR_VER] & (1 << mver))
+                        break;
+        return mver;
+}
+
 static inline int ata_id_current_chs_valid(const u16 *id)
 {
         /* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command