linux.git/drivers/scsi/device_handler, branch v4.6-rc2

scsi_dh_alua: uninitialized variable in alua_check_vpd()

2016-03-15T01:04:59+00:00

The pg_updated variable is support to be set to false at the start but
it is uninitialized.

Fixes: cb0a168cb6b8 ('scsi_dh_alua: update 'access_state' field')
Signed-off-by: Dan Carpenter 
Reviewed-by: Hannes Reinicke 
Reviewed-by: Manoj Kumar 
Signed-off-by: Martin K. Petersen

scsi_dh_emc: update 'access_state' field

2016-03-05T22:20:33+00:00

Update the 'access_state' field of the SCSI device whenever the path
state changes.

Signed-off-by: Hannes Reinecke 
Reviewed-by: Christoph Hellwig 
Reviewed-by: Johannes Thumshirn 
Signed-off-by: Martin K. Petersen

scsi_dh_rdac: update 'access_state' field

2016-03-05T22:18:28+00:00

Track attached SCSI devices and update the 'access_state' whenever the
path state of the device changes.

Signed-off-by: Hannes Reinecke 
Reviewed-by: Christoph Hellwig 
Reviewed-by: Johannes Thumshirn 
Signed-off-by: Martin K. Petersen

scsi_dh_alua: update 'access_state' field

2016-03-05T22:17:34+00:00

Track attached SCSI devices and update the 'access_state' field whenever
an ALUA state change has been detected.

Signed-off-by: Hannes Reinecke 
Reviewed-by: Bart Van Assche 
Reviewed-by: Ewan Milne 
Reviewed-by: Christoph Hellwig 
Reviewed-by: Johannes Thumshirn 
Signed-off-by: Martin K. Petersen

scsi_dh_alua: use common definitions for ALUA state

2016-03-05T22:16:48+00:00

scsi_proto.h now contains definitions for the ALUA state, so we don't
have to carry them in the device handler.

Signed-off-by: Hannes Reinecke 
Reviewed-by: Bart van Assche 
Reviewed-by: Christoph Hellwig 
Reviewed-by: Johannes Thumshirn 
Signed-off-by: Martin K. Petersen

scsi_dh_alua: Update version to 2.0

2016-02-24T02:27:02+00:00

[mkp: Fixed merge due to patches 20-22 of series being postponed]

Reviewed-by: Christoph Hellwig 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen

scsi_dh: add 'rescan' callback

2016-02-24T02:27:02+00:00

If a device needs to be rescanned the device_handler might need
to be rechecked, too.
So add a 'rescan' callback to the device handler and call it
upon scsi_rescan_device(). The rescan callback will be invoked
from the Unit Attention handling of ASC/ASCQ 3F 03
(INQUIRY DATA HAS CHANGED).

Reviewed-by: Bart Van Assche 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen

scsi_dh_alua: Send TEST UNIT READY to poll for transitioning

2016-02-24T02:27:02+00:00

Sending a 'REPORT TARGET PORT GROUP' command is a costly operation,
as the array has to gather information about all ports.
So instead of using RTPG to poll for a status update when a port
is in transitioning we should be sending a TEST UNIT READY, and
wait for the sense code to report success.

Reviewed-by: Bart Van Assche 
Reviewed-by: Ewan Milne 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen

scsi_dh_alua: update all port states

2016-02-24T02:27:02+00:00

When we read in the target port group state we should be
updating all affected port groups, otherwise we risk
running out of sync.

Reviewed-by: Bart Van Assche 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen

scsi_dh_alua: Recheck state on unit attention

2016-02-24T02:27:02+00:00

When we receive a unit attention code of 'ALUA state changed'
we should recheck the state, as it might be due to an implicit
ALUA state transition. This allows us to return NEEDS_RETRY
instead of ADD_TO_MLQUEUE, allowing to terminate the retries
after a certain time.
At the same time a workqueue item might already be queued, which
should be started immediately to avoid any delays.

Reviewed-by: Bart Van Assche 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen