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| author | John Garry <john.garry@huawei.com> | 2019-04-12 16:57:56 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-31 06:47:27 -0700 |
| commit | f2e6ac6d554f5075ff517420eaea4304023e51f6 (patch) | |
| tree | 7bdbdcd588f0f34cad28d21b73ee748e46ec7bc2 /drivers/scsi | |
| parent | 5ea7f30c081a1094ce3d787111690825d18fdc21 (diff) | |
| download | linux-stable-f2e6ac6d554f5075ff517420eaea4304023e51f6.tar.gz linux-stable-f2e6ac6d554f5075ff517420eaea4304023e51f6.tar.bz2 linux-stable-f2e6ac6d554f5075ff517420eaea4304023e51f6.zip | |
scsi: libsas: Do discovery on empty PHY to update PHY info
[ Upstream commit d8649fc1c5e40e691d589ed825998c36a947491c ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/libsas/sas_expander.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c index 1c0d2784574a..ffea620a147d 100644 --- a/drivers/scsi/libsas/sas_expander.c +++ b/drivers/scsi/libsas/sas_expander.c @@ -2038,6 +2038,11 @@ static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last) 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)) { |