[PATCH] lpfc: correct device removal deadlock after link bounce

[James Smart <james.smart@emulex.com>]

This patch, applicable to 8G/4G/2G adapters, adds a call that 
resumes transmit operations after a link bounce. Without it, targets
that tried to suspend exchanges after a link bounce (such as tape devices
using sequence level error recovery) would never resume io operation,
causing scan failures, and eventually deadlocks if a device removal
request is made.

The patches were cut against Christoph's scsi-queue.git,
branch "drivers-for-3.18".  The driver rev cut against is 10.4.8000.0

-- james s


Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: Dick Kennedy <dick.kennedy@emulex.com>
---
 lpfc_els.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff -upNr a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
--- a/drivers/scsi/lpfc/lpfc_els.c	2014-12-29 12:48:08.000000000 -0500
+++ b/drivers/scsi/lpfc/lpfc_els.c	2014-12-30 11:23:04.344426606 -0500
@@ -2225,6 +2225,15 @@ lpfc_adisc_done(struct lpfc_vport *vport
 	if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
 	    !(vport->fc_flag & FC_RSCN_MODE) &&
 	    (phba->sli_rev < LPFC_SLI_REV4)) {
+		/* The ADISCs are complete.  Doesn't matter if they
+		 * succeeded or failed because the ADISC completion
+		 * routine guarantees to call the state machine and
+		 * the RPI is either unregistered (failed ADISC response)
+		 * or the RPI is still valid and the node is marked
+		 * mapped for a target.  The exchanges should be in the
+		 * correct state. This code is specific to SLI3.
+		 */
+		lpfc_issue_clear_la(phba, vport);
 		lpfc_issue_reg_vpi(phba, vport);
 		return;
 	}