From 7d1d865181185bdf1316d236b1b4bd02c9020729 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 20 Mar 2012 10:50:27 -0700 Subject: [PATCH] [SCSI] libsas: fix false positive 'device attached' conditions Normalize phy->attached_sas_addr to return a zero-address in the case when device-type == NO_DEVICE or the linkrate is invalid to handle expanders that put non-zero sas addresses in the discovery response: sas: ex 5001b4da000f903f phy02:U:0 attached: 0100000000000000 (no device) sas: ex 5001b4da000f903f phy01:U:0 attached: 0100000000000000 (no device) sas: ex 5001b4da000f903f phy03:U:0 attached: 0100000000000000 (no device) sas: ex 5001b4da000f903f phy00:U:0 attached: 0100000000000000 (no device) Reported-by: Andrzej Jakowski Signed-off-by: Dan Williams Cc: stable@vger.kernel.org Signed-off-by: James Bottomley --- drivers/scsi/libsas/sas_expander.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c index 75247a176c6b..caa0525d2523 100644 --- a/drivers/scsi/libsas/sas_expander.c +++ b/drivers/scsi/libsas/sas_expander.c @@ -245,7 +245,14 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp) phy->attached_sata_ps = dr->attached_sata_ps; phy->attached_iproto = dr->iproto << 1; phy->attached_tproto = dr->tproto << 1; - memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE); + /* help some expanders that fail to zero sas_address in the 'no + * device' case + */ + if (phy->attached_dev_type == NO_DEVICE || + phy->linkrate < SAS_LINK_RATE_1_5_GBPS) + memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE); + else + memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE); phy->attached_phy_id = dr->attached_phy_id; phy->phy_change_count = dr->change_count; phy->routing_attr = dr->routing_attr; -- 2.20.1