bnxt_en: Disable interrupts when allocating CP rings or NQs.

When calling firmware to allocate a CP ring or NQ, an interrupt associated
with that ring may be generated immediately before the doorbell is even
setup after the firmware call returns.  When servicing the interrupt, the
driver may crash when trying to access the doorbell.

Fix it by disabling interrupt on that vector until the doorbell is
set up.

Fixes: 697197e5a173 ("bnxt_en: Re-structure doorbells.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 6a512871176b..8bc7e495b027 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -4973,12 +4973,18 @@ static int bnxt_hwrm_ring_alloc(struct bnxt *bp)
                 struct bnxt_cp_ring_info *cpr = &bnapi->cp_ring;
                 struct bnxt_ring_struct *ring = &cpr->cp_ring_struct;
                 u32 map_idx = ring->map_idx;
+                unsigned int vector;
 
+                vector = bp->irq_tbl[map_idx].vector;
+                disable_irq_nosync(vector);
                 rc = hwrm_ring_alloc_send_msg(bp, ring, type, map_idx);
-                if (rc)
+                if (rc) {
+                        enable_irq(vector);
                         goto err_out;
+                }
                 bnxt_set_db(bp, &cpr->cp_db, type, map_idx, ring->fw_ring_id);
                 bnxt_db_nq(bp, &cpr->cp_db, cpr->cp_raw_cons);
+                enable_irq(vector);
                 bp->grp_info[i].cp_fw_ring_id = ring->fw_ring_id;
 
                 if (!i) {