[SCSI] lpfc 8.3.35: Fix interrupt delay multipler conversion for eq_create

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

2 files changed, 12 insertions, 5 deletions

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 219bf534ef99..f0e5aea80810 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -12099,6 +12099,7 @@ lpfc_modify_fcp_eq_delay(struct lpfc_hba *phba, uint16_t startq)
         struct lpfc_queue *eq;
         int cnt, rc, length, status = 0;
         uint32_t shdr_status, shdr_add_status;
+        uint32_t result;
         int fcp_eqidx;
         union lpfc_sli4_cfg_shdr *shdr;
         uint16_t dmult;
@@ -12117,8 +12118,11 @@ lpfc_modify_fcp_eq_delay(struct lpfc_hba *phba, uint16_t startq)
         eq_delay = &mbox->u.mqe.un.eq_delay;
 
         /* Calculate delay multiper from maximum interrupt per second */
-        dmult = phba->cfg_fcp_imax / phba->cfg_fcp_io_channel;
-        dmult = LPFC_DMULT_CONST/dmult - 1;
+        result = phba->cfg_fcp_imax / phba->cfg_fcp_io_channel;
+        if (result > LPFC_DMULT_CONST)
+                dmult = 0;
+        else
+                dmult = LPFC_DMULT_CONST/result - 1;
 
         cnt = 0;
         for (fcp_eqidx = startq; fcp_eqidx < phba->cfg_fcp_io_channel;
@@ -12174,7 +12178,7 @@ lpfc_modify_fcp_eq_delay(struct lpfc_hba *phba, uint16_t startq)
  * fails this function will return -ENXIO.
  **/
 uint32_t
-lpfc_eq_create(struct lpfc_hba *phba, struct lpfc_queue *eq, uint16_t imax)
+lpfc_eq_create(struct lpfc_hba *phba, struct lpfc_queue *eq, uint32_t imax)
 {
         struct lpfc_mbx_eq_create *eq_create;
         LPFC_MBOXQ_t *mbox;
@@ -12206,7 +12210,10 @@ lpfc_eq_create(struct lpfc_hba *phba, struct lpfc_queue *eq, uint16_t imax)
                LPFC_EQE_SIZE);
         bf_set(lpfc_eq_context_valid, &eq_create->u.request.context, 1);
         /* Calculate delay multiper from maximum interrupt per second */
-        dmult = LPFC_DMULT_CONST/imax - 1;
+        if (imax > LPFC_DMULT_CONST)
+                dmult = 0;
+        else
+                dmult = LPFC_DMULT_CONST/imax - 1;
         bf_set(lpfc_eq_context_delay_multi, &eq_create->u.request.context,
                dmult);
         switch (eq->entry_count) {
diff --git a/drivers/scsi/lpfc/lpfc_sli4.h b/drivers/scsi/lpfc/lpfc_sli4.h
index bd4bc4342ae2..61ff9aac918d 100644
--- a/drivers/scsi/lpfc/lpfc_sli4.h
+++ b/drivers/scsi/lpfc/lpfc_sli4.h
@@ -626,7 +626,7 @@ void lpfc_sli4_hba_reset(struct lpfc_hba *);
 struct lpfc_queue *lpfc_sli4_queue_alloc(struct lpfc_hba *, uint32_t,
                         uint32_t);
 void lpfc_sli4_queue_free(struct lpfc_queue *);
-uint32_t lpfc_eq_create(struct lpfc_hba *, struct lpfc_queue *, uint16_t);
+uint32_t lpfc_eq_create(struct lpfc_hba *, struct lpfc_queue *, uint32_t);
 uint32_t lpfc_modify_fcp_eq_delay(struct lpfc_hba *, uint16_t);
 uint32_t lpfc_cq_create(struct lpfc_hba *, struct lpfc_queue *,
                         struct lpfc_queue *, uint32_t, uint32_t);