diff options
Diffstat (limited to 'drivers/scsi/scsi_transport_sas.c')
| -rw-r--r-- | drivers/scsi/scsi_transport_sas.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c index ab3bd0b5ffd9..7d69a25d2004 100644 --- a/drivers/scsi/scsi_transport_sas.c +++ b/drivers/scsi/scsi_transport_sas.c @@ -1060,6 +1060,29 @@ int scsi_is_sas_port(const struct device *dev) EXPORT_SYMBOL(scsi_is_sas_port); /** + * sas_port_get_phy - try to take a reference on a port member + * @port: port to check + */ +struct sas_phy *sas_port_get_phy(struct sas_port *port) +{ + struct sas_phy *phy; + + mutex_lock(&port->phy_list_mutex); + if (list_empty(&port->phy_list)) + phy = NULL; + else { + struct list_head *ent = port->phy_list.next; + + phy = list_entry(ent, typeof(*phy), port_siblings); + get_device(&phy->dev); + } + mutex_unlock(&port->phy_list_mutex); + + return phy; +} +EXPORT_SYMBOL(sas_port_get_phy); + +/** * sas_port_add_phy - add another phy to a port to form a wide port * @port: port to add the phy to * @phy: phy to add |