scsi: libsas: initialize sas_phy status according to response of DISCOVER
authorchenxiang <chenxiang66@hisilicon.com>
Thu, 4 Jan 2018 13:04:33 +0000 (21:04 +0800)
committerMartin K. Petersen <martin.petersen@oracle.com>
Tue, 9 Jan 2018 02:43:05 +0000 (21:43 -0500)
commitaffc67788fe5dfffad5cda3d461db5cf2b2ff2b0
treee52aecf25376760e9e21092e59d11708dc86e78d
parent2b23d9509fd7174b362482cf5f3b5f9a2265bc33
scsi: libsas: initialize sas_phy status according to response of DISCOVER

The status of SAS PHY is in sas_phy->enabled. There is an issue that the
status of a remote SAS PHY may be initialized incorrectly: if disable
remote SAS PHY through sysfs interface (such as echo 0 >
/sys/class/sas_phy/phy-1:0:0/enable), then reboot the system, and we
will find the status of remote SAS PHY which is disabled before is
1 (cat /sys/class/sas_phy/phy-1:0:0/enable). But actually the status of
remote SAS PHY is disabled and the device attached is not found.

In SAS protocol, NEGOTIATED LOGICAL LINK RATE field of DISCOVER response
is 0x1 when remote SAS PHY is disabled. So initialize sas_phy->enabled
according to the value of NEGOTIATED LOGICAL LINK RATE field.

Signed-off-by: chenxiang <chenxiang66@hisilicon.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
drivers/scsi/libsas/sas_expander.c