libata-link: implement ata_link_abort()

Implement ata_link_abort().
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/libata-core.c

@@ -7050,6 +7050,7 @@ EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
 EXPORT_SYMBOL_GPL(ata_eng_timeout);
 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
+EXPORT_SYMBOL_GPL(ata_link_abort);
 EXPORT_SYMBOL_GPL(ata_port_abort);
 EXPORT_SYMBOL_GPL(ata_port_freeze);
 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);

drivers/ata/libata-eh.c

@@ -719,19 +719,7 @@ void ata_port_schedule_eh(struct ata_port *ap)
 	DPRINTK("port EH scheduled\n");
 }
 
-/**
- *	ata_port_abort - abort all qc's on the port
- *	@ap: ATA port to abort qc's for
- *
- *	Abort all active qc's of @ap and schedule EH.
- *
- *	LOCKING:
- *	spin_lock_irqsave(host lock)
- *
- *	RETURNS:
- *	Number of aborted qc's.
- */
-int ata_port_abort(struct ata_port *ap)
+static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
 {
 	int tag, nr_aborted = 0;
 
@@ -743,7 +731,7 @@ int ata_port_abort(struct ata_port *ap)
 	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
 		struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
 
-		if (qc) {
+		if (qc && (!link || qc->dev->link == link)) {
 			qc->flags |= ATA_QCFLAG_FAILED;
 			ata_qc_complete(qc);
 			nr_aborted++;
@@ -756,6 +744,40 @@ int ata_port_abort(struct ata_port *ap)
 	return nr_aborted;
 }
 
+/**
+ *	ata_link_abort - abort all qc's on the link
+ *	@link: ATA link to abort qc's for
+ *
+ *	Abort all active qc's active on @link and schedule EH.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	Number of aborted qc's.
+ */
+int ata_link_abort(struct ata_link *link)
+{
+	return ata_do_link_abort(link->ap, link);
+}
+
+/**
+ *	ata_port_abort - abort all qc's on the port
+ *	@ap: ATA port to abort qc's for
+ *
+ *	Abort all active qc's of @ap and schedule EH.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Number of aborted qc's.
+ */
+int ata_port_abort(struct ata_port *ap)
+{
+	return ata_do_link_abort(ap, NULL);
+}
+
 /**
  *	__ata_port_freeze - freeze port
  *	@ap: ATA port to freeze

include/linux/libata.h

@@ -906,6 +906,7 @@ extern unsigned long ata_pci_default_filter(struct ata_device *, unsigned long);
 extern void ata_eng_timeout(struct ata_port *ap);
 
 extern void ata_port_schedule_eh(struct ata_port *ap);
+extern int ata_link_abort(struct ata_link *link);
 extern int ata_port_abort(struct ata_port *ap);
 extern int ata_port_freeze(struct ata_port *ap);