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authorJohn Garry <john.garry@huawei.com>2019-04-12 16:57:56 +0800
committerMartin K. Petersen <martin.petersen@oracle.com>2019-04-15 18:55:01 -0400
commitd8649fc1c5e40e691d589ed825998c36a947491c (patch)
treeb0cbf9932a4cb53546694e63a02afb858bfb5b5d /drivers/scsi/libsas
parent085f104a83d565097644889bf1f6f1aa6d345cb5 (diff)
downloadlinux-d8649fc1c5e40e691d589ed825998c36a947491c.tar.bz2
scsi: libsas: Do discovery on empty PHY to update PHY info
When we discover the PHY is empty in sas_rediscover_dev(), the PHY information (like negotiated linkrate) is not updated. As such, for a user examining sysfs for that PHY, they would see incorrect values: root@(none)$ cd /sys/class/sas_phy/phy-0:0:20 root@(none)$ more negotiated_linkrate 3.0 Gbit root@(none)$ echo 0 > enable root@(none)$ more negotiated_linkrate 3.0 Gbit So fix this, simply discover the PHY again, even though we know it's empty; in the above example, this gives us: root@(none)$ more negotiated_linkrate Phy disabled We must do this after unregistering the device associated with the PHY (in sas_unregister_devs_sas_addr()). Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/libsas')
-rw-r--r--drivers/scsi/libsas/sas_expander.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 6f569a65d791..ad96bc843acc 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -2068,6 +2068,11 @@ static int sas_rediscover_dev(struct domain_device *dev, int phy_id,
if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM)) {
phy->phy_state = PHY_EMPTY;
sas_unregister_devs_sas_addr(dev, phy_id, last);
+ /*
+ * Even though the PHY is empty, for convenience we discover
+ * the PHY to update the PHY info, like negotiated linkrate.
+ */
+ sas_ex_phy_discover(dev, phy_id);
return res;
} else if (SAS_ADDR(sas_addr) == SAS_ADDR(phy->attached_sas_addr) &&
dev_type_flutter(type, phy->attached_dev_type)) {