scsi: lpfc: Skip RSCN processing when FC_UNLOADING flag is set

JIRA: https://issues.redhat.com/browse/RHEL-103751

commit 37c893e
Author: Justin Tee <justin.tee@broadcom.com>
Date:   Wed Jun 18 12:21:29 2025 -0700

    scsi: lpfc: Skip RSCN processing when FC_UNLOADING flag is set

    During rmmod, all ndlp objects are cleaned up and marked with the
    NLP_DROPPED flag indicating that an ndlp object is currently being
    released.  Thus, if an RSCN is received during driver unload, then
    walking the fc_nodes list to process the RSCN is unnecessary because the
    ndlp objects are very shortly going to be released.

    In the lpfc_rscn_recovery_check routine, early return if the driver is in
    the middle of unloading by checking for the FC_UNLOADING flag.

    Signed-off-by: Justin Tee <justin.tee@broadcom.com>
    Link: https://lore.kernel.org/r/20250618192138.124116-5-justintee8345@gmail.com
    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: Paul Ely <paely@redhat.com>

Author: Paul Ely

drivers/scsi/lpfc/lpfc_els.c

@@ -7860,6 +7860,13 @@ lpfc_rscn_recovery_check(struct lpfc_vport *vport)
 
 	/* Move all affected nodes by pending RSCNs to NPR state. */
 	list_for_each_entry_safe(ndlp, n, &vport->fc_nodes, nlp_listp) {
+		if (test_bit(FC_UNLOADING, &vport->load_flag)) {
+			lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
+					 "1000 %s Unloading set\n",
+					 __func__);
+			return 0;
+		}
+
 		if ((ndlp->nlp_state == NLP_STE_UNUSED_NODE) ||
 		    !lpfc_rscn_payload_check(vport, ndlp->nlp_DID))
 			continue;