linux-toradex.git/drivers/scsi/isci/remote_node_context.c, branch v3.18.21

isci: End the RNC resumption wait when the RNC is destroyed.

2012-05-17T21:33:44+00:00

While the RNC is suspended for I/O cleanup, the remote device can be
stopped and the RNC setup for destruction.  These changes accomodate that
case in the abort path.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Fixed RNC bug that lost the suspension or resumption during destroy

2012-05-17T21:33:44+00:00

This fix corrects the saving of resume parameters when the destruction
of the RNC has already been directed, and makes sure not to overwrite
the RNC destruction callbacks.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Fix RNC AWAIT_SUSPENSION->INVALIDATING transition.

2012-05-17T21:33:44+00:00

The RNC state machine would incorrectly transition from
SCI_RNC_AWAIT_SUSPENSION directly to SCI_RNC_INVALIDATING when a destruct
request was made.  This would skip the increment of the suspension count
and the abort of pending TCs (although the invalidating state would at
least cleanup outstanding TCs).

Instead, the RNC will transition to SCI_RNC_SUSPENDED and then start the
destruction process.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Don't wait for an RNC suspend if it's being destroyed.

2012-05-17T21:33:43+00:00

Make sure that the wait for suspend can handle the RNC destruction case.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Added timeouts to RNC suspensions in the abort path.

2012-05-17T21:33:42+00:00

This change adds timeouts to the RNC suspension wait.  It makes the
suspend and resume timeouts the same.

The previous resume timeout of 5 ms was too short, and timeouts were
seen in resumptions of devices in the abort task/LUN reset path - which
would receive an RNC resumed message within a tenth of a second later.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Fix RNC suspend call for SCI_RESUMING state.

2012-05-17T21:33:41+00:00

Instead of immediately transitioning to the SCI_RNC_AWAIT_SUSPENSION
state, handle the SCI_RNC_RESUMING suspend transition from the
SCI_RNC_READY state like the SCI_RNC_INVALIDATING --> SCI_RNC_POSTING
transitions do now, by setting the destination state for the entry
into the READY state.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: When in the abort path, defeat other resume calls until done.

2012-05-17T21:33:41+00:00

Completion of I/Os during the one of the abort path interface calls
from libsas can drive remote device state changes and the resumption
of the device RNC.  This is a problem when the abort path is
attempting to cleanup outstanding I/O at the same time - the resumption
can prevent the termination from occuring correctly.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Implement waiting for suspend in the abort path.

2012-05-17T21:33:41+00:00

In order to prevent a device from receiving an I/O request while still
in an RNC suspending or resuming state (and therefore failing that
I/O back to libsas with a reset required status) wait for the RNC state
change before proceding in the abort path.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Manage the LLHANG timer enable/disable per-device.

2012-05-17T21:33:40+00:00

The LLHANG timer should be enabled once per device.  This patch corrects
both the timer enable and the timer disable for the remote device.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Save the suspension hint for upcoming suspensions.

2012-05-17T21:33:40+00:00

In the case of a suspend call while in SCI_RNC_POSTING or INVALIDATING
states, the LLHANG detect needed to be saved so the upcoming suspension
would enable it correctly.  The unused suspend callback parameters were
removed.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams