[PATCH v6 3/4] scsi: libsas: Set port when ex_phy is added or deleted

Xingui Yang
2024-03-12T14:12:45Z

We found that when ex_phy was attached and added to the parent wide port,
ex_phy->port was not set, resulting in sas_unregister_devs_sas_addr() not
calling sas_port_delete_phy() when deleting the phy, and the deleted phy
was still on the parent wide port's phy_list.

When we use sas_port_add_ex_phy() to set ex_phy->port to solve the above
problem, we find that after all the phys of the parent_port are removed and
the number of phy becomes 0, the parent_port will not be set to NULL.
Causes the freed parent port to be used when attaching a new ex_phy in
sas_ex_add_parent_port().

So use sas_port_add_ex_phy() instead of sas_port_add_phy() to set
ex_phy->port when ex_phy is added to the parent port, and set
ex_dev->parent_port to NULL when the number of phy on the port becomes 0.

Signed-off-by: Xingui Yang <yangxingui@huawei.com>
---
drivers/scsi/libsas/sas_expander.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index f28a83803947..77daae36232b 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -45,7 +45,7 @@ static void sas_ex_add_parent_port(struct domain_device *dev, int phy_id)
BUG_ON(sas_port_add(ex->parent_port));
sas_port_mark_backlink(ex->parent_port);
}
- sas_port_add_phy(ex->parent_port, ex_phy->phy);
+ sas_port_add_ex_phy(ex->parent_port, ex_phy);
}

/* ---------- SMP task management ---------- */
@@ -1879,9 +1879,12 @@ static void sas_unregister_devs_sas_addr(struct domain_device *parent,
if (phy->port) {
sas_port_delete_phy(phy->port, phy->phy);
sas_device_set_phy(found, phy->port);
- if (phy->port->num_phys == 0)
+ if (phy->port->num_phys == 0) {
list_add_tail(&phy->port->del_list,
&parent->port->sas_port_del_list);
+ if (ex_dev->parent_port == phy->port)
+ ex_dev->parent_port = NULL;
+ }
phy->port = NULL;
}
}
--
2.17.1