diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 7f701cbe14ab83400992c0dd9344705db8f54e68..96039671e3b9e6aac939833554fc95291609d6d1 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -2660,6 +2660,9 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	host->iomap = pcim_iomap_table(pdev);
 	host->private_data = hpriv;
 
+	if (!(hpriv->cap & HOST_CAP_SSS))
+		host->flags |= ATA_HOST_PARALLEL_SCAN;
+
 	if (pi.flags & ATA_FLAG_EM)
 		ahci_reset_em(host);
 
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index c507a9ac78f475e8569d920f0b5404553fff7b90..f810078fafcc691a6fc93d13022ba68446711dc1 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5920,6 +5920,15 @@ static void async_port_probe(void *data, async_cookie_t cookie)
 {
 	int rc;
 	struct ata_port *ap = data;
+
+	/*
+	 * If we're not allowed to scan this host in parallel,
+	 * we need to wait until all previous scans have completed
+	 * before going further.
+	 */
+	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN))
+		async_synchronize_cookie(cookie);
+
 	/* probe */
 	if (ap->ops->error_handler) {
 		struct ata_eh_info *ehi = &ap->link.eh_info;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 4f7c8fb4d3fe6173b80788be019e5439efacdbbb..b6b8a7f3ec66064778cf2b63b6eaa4a03dc25495 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -239,6 +239,7 @@ enum {
 	/* host set flags */
 	ATA_HOST_SIMPLEX	= (1 << 0),	/* Host is simplex, one DMA channel per host only */
 	ATA_HOST_STARTED	= (1 << 1),	/* Host started */
+	ATA_HOST_PARALLEL_SCAN	= (1 << 2),	/* Ports on this host can be scanned in parallel */
 
 	/* bits 24:31 of host->flags are reserved for LLD specific flags */