[PATCH v2 3/5] ibmvfc: treat H_CLOSED as success during sub-CRQ registration

[Tyrel Datwyler <tyreld@linux.ibm.com>]

A non-zero return code for H_REG_SUB_CRQ is currently treated as a
failure resulting in failing sub-CRQ setup. The case of H_CLOSED should
not be treated as a failure. This return code translates to a successful
sub-CRQ registration by the hypervisor, and is meant to communicate back
that there is currently no partner VIOS CRQ connection established as of
yet. This is a common occurrence during a disconnect where the client
adapter can possibly come back up prior to the partner adapter.

For non-zero return code from H_REG_SUB_CRQ treat a H_CLOSED as success
so that sub-CRQs are successfully setup.

Fixes: faacf8c5f1d5 ("ibmvfc: add alloc/dealloc routines for SCSI Sub-CRQ Channels")
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Reviewed-by: Brian King <brking@linux.ibm.com>
---
 drivers/scsi/ibmvscsi/ibmvfc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 3dd20f383453..ba6fcf9cbc57 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -5636,7 +5636,8 @@ static int ibmvfc_register_scsi_channel(struct ibmvfc_host *vhost,
 	rc = h_reg_sub_crq(vdev->unit_address, scrq->msg_token, PAGE_SIZE,
 			   &scrq->cookie, &scrq->hw_irq);
 
-	if (rc) {
+	/* H_CLOSED indicates successful register, but no CRQ partner */
+	if (rc && rc != H_CLOSED) {
 		dev_warn(dev, "Error registering sub-crq: %d\n", rc);
 		if (rc == H_PARAMETER)
 			dev_warn_once(dev, "Firmware may not support MQ\n");
-- 
2.27.0