[SCSI] libsas: fix loopback topology bug during discovery
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>
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 505ffe3..f3f693b 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -244,6 +244,11 @@
* 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;