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>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 6a512871176bd4ad807b028632f171913daaacc3..8bc7e495b027083942e6963c56bed62a25fd6f5d 100644 (file)
--- 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) {