cnic: Fix crash during bnx2x MTU change.

cnic_service_bnx2x() irq handler can be called during chip reset from
MTU change.  Need to check that the cnic's device state is up before
handling the irq.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c
index 9781942992e..4b451a7c03e 100644
--- a/drivers/net/cnic.c
+++ b/drivers/net/cnic.c
@@ -2334,13 +2334,13 @@ static int cnic_service_bnx2x(void *data, void *status_blk)
         struct cnic_local *cp = dev->cnic_priv;
         u16 prod = cp->kcq_prod_idx & MAX_KCQ_IDX;
 
-        prefetch(cp->status_blk.bnx2x);
-        prefetch(&cp->kcq[KCQ_PG(prod)][KCQ_IDX(prod)]);
+        if (likely(test_bit(CNIC_F_CNIC_UP, &dev->flags))) {
+                prefetch(cp->status_blk.bnx2x);
+                prefetch(&cp->kcq[KCQ_PG(prod)][KCQ_IDX(prod)]);
 
-        if (likely(test_bit(CNIC_F_CNIC_UP, &dev->flags)))
                 tasklet_schedule(&cp->cnic_irq_task);
-
-        cnic_chk_pkt_rings(cp);
+                cnic_chk_pkt_rings(cp);
+        }
 
         return 0;
 }