libata: const-ification bombing run
Enforce access rules where appropriate.
If the compiler is smart enough, this may buy us an optimization or two
as a side effect.
diff --git a/drivers/scsi/libata.h b/drivers/scsi/libata.h
index 67d752c..3d60190 100644
--- a/drivers/scsi/libata.h
+++ b/drivers/scsi/libata.h
@@ -48,7 +48,7 @@
extern int ata_check_atapi_dma(struct ata_queued_cmd *qc);
extern void ata_dev_select(struct ata_port *ap, unsigned int device,
unsigned int wait, unsigned int can_sleep);
-extern void ata_tf_to_host_nolock(struct ata_port *ap, struct ata_taskfile *tf);
+extern void ata_tf_to_host_nolock(struct ata_port *ap, const struct ata_taskfile *tf);
extern void swap_buf_le16(u16 *buf, unsigned int buf_words);