1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index d1dfe872ee30..95e6159b44cf 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1381,6 +1381,21 @@ static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
         return *(struct ata_port **)&host->hostdata[0];
 }
 
+static inline int ata_check_ready(u8 status)
+{
+        /* Some controllers report 0x77 or 0x7f during intermediate
+         * not-ready stages.
+         */
+        if (status == 0x77 || status == 0x7f)
+                return 0;
+
+        /* 0xff indicates either no device or device not ready */
+        if (status == 0xff)
+                return -ENODEV;
+
+        return !(status & ATA_BUSY);
+}
+
 
 /**************************************************************************
  * PMP - drivers/ata/libata-pmp.c