[SCSI] libsas: fix loopback topology bug during discovery
jack_wang [Sat, 19 Feb 2011 10:20:53 +0000 (18:20 +0800)]
In some test envirenment, there is loopback topology test. We should
handle this during discovery.

Signed-off-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/scsi/libsas/sas_expander.c

index 505ffe3..f3f693b 100644 (file)
@@ -244,6 +244,11 @@ static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
                 * dev to host FIS as described in section G.5 of
                 * sas-2 r 04b */
                dr = &((struct smp_resp *)disc_resp)->disc;
+               if (memcmp(dev->sas_addr, dr->attached_sas_addr,
+                         SAS_ADDR_SIZE) == 0) {
+                       sas_printk("Found loopback topology, just ignore it!\n");
+                       return 0;
+               }
                if (!(dr->attached_dev_type == 0 &&
                      dr->attached_sata_dev))
                        break;