diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 985283c..007d188 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1949,6 +1949,7 @@
 	unsigned int err_mask;
 	int rc;
 
+	dev->flags &= ~ATA_DFLAG_PIO;
 	if (dev->xfer_shift == ATA_SHIFT_PIO)
 		dev->flags |= ATA_DFLAG_PIO;