diff --git a/drivers/ata/pata_arasan_cf.c b/drivers/ata/pata_arasan_cf.c
index 80fe0f6fed2900865a0e3709b5ec7164ea91477b..b4d54771c9fe0ab48877b8baaf2c81aba9991730 100644
--- a/drivers/ata/pata_arasan_cf.c
+++ b/drivers/ata/pata_arasan_cf.c
@@ -565,7 +565,7 @@ static void data_xfer(struct work_struct *work)
 	qc->ap->hsm_task_state = HSM_ST_ERR;
 
 	cf_ctrl_reset(acdev);
-	spin_unlock_irqrestore(qc->ap->lock, flags);
+	spin_unlock_irqrestore(&acdev->host->lock, flags);
 sff_intr:
 	dma_complete(acdev);
 }