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authorjack_wang <jack_wang@usish.com>2011-02-19 11:20:53 +0100
committerJames Bottomley <James.Bottomley@suse.de>2011-02-28 18:40:34 +0100
commit183ce896d726fb987da589fa8e36fb7214a494cc (patch)
tree741d899331336f132274ba2fb116211725d398a2 /drivers/scsi/libsas/sas_expander.c
parent[SCSI] lpfc: block target when port queueing limit is hit (diff)
downloadlinux-183ce896d726fb987da589fa8e36fb7214a494cc.tar.xz
linux-183ce896d726fb987da589fa8e36fb7214a494cc.zip
[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>
Diffstat (limited to 'drivers/scsi/libsas/sas_expander.c')
-rw-r--r--drivers/scsi/libsas/sas_expander.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 505ffe358293..f3f693b772ac 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -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;