libata: add ata_ratelimit(), use it in AHCI driver irq handler
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 4d45179..7929cfc 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -410,6 +410,8 @@
 extern int ata_scsi_error(struct Scsi_Host *host);
 extern int ata_scsi_release(struct Scsi_Host *host);
 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
+extern int ata_ratelimit(void);
+
 /*
  * Default driver ops implementations
  */