libata: fix EH locking

Wrap ata_qc_complete() calls in EH context in spinlocks, to prevent
races (mainly in ATAPI code paths).
diff --git a/drivers/scsi/sata_promise.c b/drivers/scsi/sata_promise.c
index defcc1f..b8dc49f 100644
--- a/drivers/scsi/sata_promise.c
+++ b/drivers/scsi/sata_promise.c
@@ -325,11 +325,15 @@
 
 static void pdc_eng_timeout(struct ata_port *ap)
 {
+	struct ata_host_set *host_set = ap->host_set;
 	u8 drv_stat;
 	struct ata_queued_cmd *qc;
+	unsigned long flags;
 
 	DPRINTK("ENTER\n");
 
+	spin_lock_irqsave(&host_set->lock, flags);
+
 	qc = ata_qc_from_tag(ap, ap->active_tag);
 	if (!qc) {
 		printk(KERN_ERR "ata%u: BUG: timeout without command\n",
@@ -363,6 +367,7 @@
 	}
 
 out:
+	spin_unlock_irqrestore(&host_set->lock, flags);
 	DPRINTK("EXIT\n");
 }