libata: separate out ata_ncq_enabled()

Separate out ata_ncq_enabled().

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

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index b71a7ef..63c808d 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -315,9 +315,7 @@ int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
        tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
        tf->flags |= tf_flags;
 
-       if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
-                          ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ &&
-           likely(tag != ATA_TAG_INTERNAL)) {
+       if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
                /* yay, NCQ */
                if (!lba_48_ok(block, n_block))
                        return -ERANGE;

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 5db50fa..5233e47 100644 (file)
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1033,6 +1033,21 @@ static inline u8 ata_chk_status(struct ata_port *ap)
        return ap->ops->check_status(ap);
 }
 
+/**
+ *     ata_ncq_enabled - Test whether NCQ is enabled
+ *     @dev: ATA device to test for
+ *
+ *     LOCKING:
+ *     spin_lock_irqsave(host lock)
+ *
+ *     RETURNS:
+ *     1 if NCQ is enabled for @dev, 0 otherwise.
+ */
+static inline int ata_ncq_enabled(struct ata_device *dev)
+{
+       return (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
+                             ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ;
+}
 
 /**
  *     ata_pause - Flush writes and pause 400 nanoseconds.