[SCSI] lpfc 8.3.32: Correct host DIF configuration that hung system

Fix system hang due to bad protection module parameters (CR: 130769)

Signed-off-by: Alex Iannicelli <alex.iannicelli@emulex.com>
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 33 insertions, 2 deletions

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 411ed48d79da..a79e2c21c5e4 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -5514,14 +5514,45 @@ lpfc_destroy_shost(struct lpfc_hba *phba)
 static void
 lpfc_setup_bg(struct lpfc_hba *phba, struct Scsi_Host *shost)
 {
+        uint32_t old_mask;
+        uint32_t old_guard;
+
         int pagecnt = 10;
         if (lpfc_prot_mask && lpfc_prot_guard) {
                 lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
                                 "1478 Registering BlockGuard with the "
                                 "SCSI layer\n");
-                scsi_host_set_prot(shost, lpfc_prot_mask);
-                scsi_host_set_guard(shost, lpfc_prot_guard);
+
+                old_mask = lpfc_prot_mask;
+                old_guard = lpfc_prot_guard;
+
+                /* Only allow supported values */
+                lpfc_prot_mask &= (SHOST_DIF_TYPE1_PROTECTION |
+                        SHOST_DIX_TYPE0_PROTECTION |
+                        SHOST_DIX_TYPE1_PROTECTION);
+                lpfc_prot_guard &= (SHOST_DIX_GUARD_IP | SHOST_DIX_GUARD_CRC);
+
+                /* DIF Type 1 protection for profiles AST1/C1 is end to end */
+                if (lpfc_prot_mask == SHOST_DIX_TYPE1_PROTECTION)
+                        lpfc_prot_mask |= SHOST_DIF_TYPE1_PROTECTION;
+
+                if (lpfc_prot_mask && lpfc_prot_guard) {
+                        if ((old_mask != lpfc_prot_mask) ||
+                                (old_guard != lpfc_prot_guard))
+                                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                        "1475 Registering BlockGuard with the "
+                                        "SCSI layer: mask %d  guard %d\n",
+                                        lpfc_prot_mask, lpfc_prot_guard);
+
+                        scsi_host_set_prot(shost, lpfc_prot_mask);
+                        scsi_host_set_guard(shost, lpfc_prot_guard);
+                } else
+                        lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                "1479 Not Registering BlockGuard with the SCSI "
+                                "layer, Bad protection parameters: %d %d\n",
+                                old_mask, old_guard);
         }
+
         if (!_dump_buf_data) {
                 while (pagecnt) {
                         spin_lock_init(&_dump_buf_lock);