1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 8817b8e6e507..83e3715d30e4 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -824,6 +824,26 @@ static struct domain_device *sas_ex_discover_end_dev(
 
 #ifdef CONFIG_SCSI_SAS_ATA
         if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
+                if (child->linkrate > parent->min_linkrate) {
+                        struct sas_phy_linkrates rates = {
+                                .maximum_linkrate = parent->min_linkrate,
+                                .minimum_linkrate = parent->min_linkrate,
+                        };
+                        int ret;
+
+                        pr_notice("ex %016llx phy%02d SATA device linkrate > min pathway connection rate, attempting to lower device linkrate\n",
+                                   SAS_ADDR(child->sas_addr), phy_id);
+                        ret = sas_smp_phy_control(parent, phy_id,
+                                                  PHY_FUNC_LINK_RESET, &rates);
+                        if (ret) {
+                                pr_err("ex %016llx phy%02d SATA device could not set linkrate (%d)\n",
+                                       SAS_ADDR(child->sas_addr), phy_id, ret);
+                                goto out_free;
+                        }
+                        pr_notice("ex %016llx phy%02d SATA device set linkrate successfully\n",
+                                  SAS_ADDR(child->sas_addr), phy_id);
+                        child->linkrate = child->min_linkrate;
+                }
                 res = sas_get_ata_info(child, phy);
                 if (res)
                         goto out_free;