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[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>
This commit is contained in:
jack_wang 2011-02-19 18:20:53 +08:00 committed by James Bottomley
parent 3496343df5
commit 183ce896d7
1 changed files with 5 additions and 0 deletions
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5
drivers/scsi/libsas/sas_expander.c
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@ -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;